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150-540: In the early 1950s, the prototypes for US military AVLBs were based on the M48A2 hull. This AVLB prototype launcher assembly used an M48 tank with its turret removed from the chassis, fitted with a launching system for the scissors bridge carried on top of the hull. This AVLB bridge launching system was designed and tested by the US Army Engineer Research & Development Laboratories at Ft. Belvoir , Virginia. After

300-650: A fire control system (FCS) in the M48. The fire control system included a rangefinder, mechanical ballistic computer, ballistic drive, and gunner's sight. Collectively, these mechanical devices resembled in miniature the fire control systems used in naval gunnery . Only after the Second World War did such systems become small enough for use in combat vehicles. These mechanical fire control systems permitted tanks to engage effectively at much longer ranges than in World War II ,

450-405: A stereoscopic model range determination occurred by measuring the distance from the observer to a target using the observer's capability of binocular vision . The coincidence rangefinder uses a single eyepiece. Light from the target enters the rangefinder through two windows located at either end of the instrument. The ARCOVE emphasis upon increased long range accuracy led to the incorporation of

600-525: A "special plea" from the Pentagon. Eleven XM1 preproduction models were manufactured between February and July 1978 at Detroit Arsenal Tank Plant . Quality problems with the engine quickly became apparent in testing. The first preproduction units that arrived at Aberdeen Proving Ground in March 1978 had serious problems. The tank accumulated mud and dirt under the hull which led to thrown tracks. Chrysler installed

750-677: A $ 200 million contract to become the sole producer of the M48A2 and started production at its Grand Blanc Tank Plant in Michigan in April 1953. The decision raised skepticism among lawmakers. Senator Estes Kefauver noted the move would effectively leave GM as the only producer of light (the M41 Walker Bulldog ) and medium tanks when the Chrysler production contract for M48A1 production was set to expire in April 1956. Months later Chrysler underbid GM in

900-589: A $ 200 million contract to start producing the tank in 1953 at the Schenectady Tank Plant in New York. All four companies were given initial production contracts in that same year for around 400 tanks each. The first Chrysler production tank was unveiled on 1 July 1952 as the 90mm Gun Tank M48 and christened the M48 Patton by Mrs. Beatrice Ayer Patton, widow of the late General George S Patton . The M48 featured

1050-456: A G305 cupola riser with 9 non-removable vision blocks installed (some versions had 7 with the 2 rear blocks deleted) between the turret roof and the cupola. It also came with a new bulged hatch cover to provide the tank commander with more headroom and allowed him to reload the weapon while remaining under armor protection. A major drawback of both these cupolas was their inability to mount either daylight or infrared vision devices. The receiver of

1200-584: A Soviet gun within 800 m (2,600 ft) and 30 degrees to either side. The tank would be armed with the 105 mm M68 gun , a licensed version of the Royal Ordnance L7 , and a 20 mm version of the M242 Bushmaster . The Army later deleted the latter from the design, seeing it as superfluous. In spring 1972, Desobry was briefed by the British on their own newly developed "Burlington" armor from

1350-641: A critical consideration for the Army, expecting to enter the European battlefield outnumbered. Instead of a gunner's sight being slaved to the gun tube, the ballistic computer and drive computed the range and elevated the gun. The gunner's primary responsibility lay in keeping the sight on the target. The mechanical ballistic computer made a more accurate computation of range possible by mathematically accounting for such factors as vehicle cant and ammunition type. Many developmental range finders based on pulses of IR light, such as

1500-563: A digital enhancement package for the A1 (M1A1D), and a commonality program to standardize parts between the U.S. Army and the Marine Corps (M1A1HC). Improvements to survivability, lethality, and protection have been sought since 2014. Further combat was seen during 2003 when U.S. forces invaded Iraq and deposed Iraqi President Saddam Hussein in the Iraq War 's Operation Iraqi Freedom. One achievement of

1650-472: A direct result of enemy fire, none of which resulted in any fatalities. Three Abrams were left behind the enemy lines after a swift attack on Talil airfield , south of Nasiriyah , on February 27. One of them was hit by enemy fire, while the other two became embedded in mud. The tanks were destroyed by U.S. forces to prevent any trophy-claim by the Iraqi Army. A total of 23 M1A1s were damaged or destroyed during

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1800-524: A distance of 1,000 yd (910 m), but was not accepted for service. Instead it was decided to use an improved version of the 90 mm gun, the T139 for the M48 production tanks. It allowed for easier barrel changing and weighed less than the preceding M36/T119 gun. It was later standardized as the 90mm Gun M41 in February 1951. The T48 and M48(Mod A) tanks featured a remote controllable machine gun mount as

1950-491: A fast, highly mobile, fully armored, lightweight vehicle. It must be able to swim, cross any terrain, and climb 30 degree hills. It must be air-transportable. It must have a simple but powerful engine, requiring little or no maintenance. The operating range should be several hundred miles. We would also like it to be invisible". The T48 project was to focus on improving the turret of the M47 Patton and upgrading performance with

2100-679: A faster deployment time, with a set-up of three minutes compared to AVLB's ten-minute set-up. First deliveries are planned in mid-2017, with low-rate initial production expected to be reached in 2019. As of 2020, The Marine Corps was divesting the AVLB as part of Force Design 2030 . The IDF refers to the AVLB as the Tagash. The first armored bridge layers to enter service with the Israel Defense Force were constructed from captured Jordanian M48s. The United States supplied launcher and bridge assemblies for

2250-472: A few other countries including Portugal , Singapore and Pakistan . M48 Patton 177.8 km (110.5 mi) The M48 Patton is an American first-generation main battle tank (MBT) introduced in February 1952, being designated as the 90mm Gun Tank: M48 . It was designed as a replacement for the M26 Pershing , M4 Sherman , M46 and M47 Patton tanks, and was the main battle tank of

2400-492: A full set of controls and displays linked by a digital data bus. These upgrades also provided the M1A2 with an improved fire control system. The M1A2 System Enhancement Package (SEP) added digital maps, Force XXI Battle Command Brigade and Below ( FBCB2 ) Linux communications system capabilities for commanders, and an improved cooling system to compensate for heat generated by the additional computer systems. The M1A2 SEP also serves as

2550-705: A gasoline-powered engine, different models were used depending on availability and manufacturer. Originally the M48(Mod A) that was built by Chrysler Defense at the OTAC Test Center (T48 Pilot #1) in 1951 used the Continental AV-1790-5B coupled to a General Motors CD-850-4A cross-drive transmission as used for the M47. The M48s built by American Locomotive used a Continental AV-1790-5C gasoline engine and either an Allison CD-850-4A or 4B cross-drive transmission. Additionally

2700-480: A magnification of x8 and a field of view of 7.5 degrees. M1 Abrams The M1 Abrams ( / ˈ eɪ b r ə m z / ) is a third-generation American main battle tank designed by Chrysler Defense (now General Dynamics Land Systems ) and named for General Creighton Abrams . Conceived for modern armored ground warfare , it is one of the heaviest tanks in service at nearly 73.6 short tons (66.8 metric tons ). It introduced several modern technologies to

2850-556: A more powerful yet more efficient gasoline engine. 1/4 and 1/8 scale design mockups of the turret were constructed during May 1950 using the T119 90mm main gun of the M47 Patton . The design study was accepted by the Army in December and a contract for the advanced production design and engineering (APE) of a 90mm armed tank was awarded to the Chrysler Defense. Hull redesign included moving

3000-415: A scraper to prevent the build-up of dirt. This did not solve the issue entirely. It was determined months later that a gauge used to tension tracks was miscalibrated. This caused the tracks to be fitted too loosely. Another problem was the ingestion of debris by the engine. The problem was determined to be caused by poorly fitting air filters. At Fort Bliss , several tanks experienced transmission issues. It

3150-522: A simple but powerful engine, requiring little or no maintenance. The operating range should be several hundred miles. We would also like it to be invisible". Some ideas proposed were to utilize a nuclear fission power plant in the R-32 or a vapor-cycled power plant fueled by hydrocarbons in the Chrysler TV-8 tank. In response to these findings an eventual replacement for the M48A2 was recommended. ARCOVE and

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3300-496: A somewhat vague memorandum of understanding in 1974 committing both parties toward commonality in tank parts. Germany had assumed that its tank would be evaluated against the GM and Chrysler's prototypes and that the best tank would be chosen for production. This misunderstanding arose from the fact that in public statements both countries had overrepresented the MOU as an agreement that Germany and

3450-425: A two-cylinder, gasoline, air-cooled engine (sometimes referred to as the "Little Joe" by tank crews) was provided to power a 28 volt, 300 ampere generator when the main engine was not needed. Fuel capacity was 200 US gal (760 L) providing a cruising range of about 70 mi (110 km). The suspension consisted of six roadwheel pairs with a torsion bar suspension system and five return rollers. There

3600-602: A variety of main guns. In January 1978, the Secretary of the Army announced that the Rheinmetall 120 mm gun would be mounted on future production versions of the XM1. This decision established the requirement for a separate program for the M1E1 (with 120 mm gun) so that the XM1 program could continue unimpeded. About 5,000 M1A1 Abrams tanks were produced from 1986 to 1992 and featured

3750-649: Is the development of a new armored vehicle launching bridge (AVLB), based on the M60A1 chassis and equipped with the new MLC 70 class Leguan bridge, which is capable of supporting the Leopard 2 A5 tanks, as well as any other tanks and armored vehicles in the Spanish inventory. For the time being in close liaison with Engineers at the Army Logistics Command has contracted for an initial 12 vehicles. They are still in service with

3900-464: Is the reduced mechanical complexity. The Tzmed assembly also enables the AVLB to bridge gaps in which the elevation of the opposing bank and the bridge itself, when laid out, is steep. The Tzmed assembly weighs in at only 13.5 tons with two bridge sections. The Spanish Army began the Programa Coraza – 2000 (Program Armor – 2000) in March 1995 to modernize and update its armor forces. One of its goals

4050-561: The U.S. Army and U.S. Marine Corps in the Vietnam War. Nearly 12,000 M48s were built, mainly by Chrysler and American Locomotive Company , from 1952 to 1961. The M48 Patton was the first U.S. medium gun tank with a four-man crew, featuring a centerline driver's compartment and no bow machine gunner. As with nearly all new armored vehicles it had a wide variety of suspension systems, cupola styles , power packs, fenders and other details among individual tanks. The early designs, up to

4200-511: The British Army 's labs. The armor performed exceptionally against shaped charges such as HEAT rounds. In September, Desobry convinced the Army to incorporate the new armor. To take full advantage of Burlington, also known as Chobham, the new tank would have to have armor around two feet thick (for comparison, the armor on the M60 is around four inches thick). General Creighton Abrams set the weight of

4350-611: The Detroit Arsenal Tank Plant (DATP) in Warren, Michigan from 1982 to 1991 (DATP also produced the 11 preproduction models in 1978. ). The U.S. Army Laboratory Command (LABCOM), under the supervision of the United States Army Research Laboratory (ARL), was also heavily involved with designing the tank with M1A1 armor resistant shells, M829A2 armor-penetrating rounds, and improved weapon range. The M1

4500-857: The Korean War . This forced the US to field older tank models, such as the M26 Pershing and M46 Patton . In response, the Army launched several design projects for a replacement of the M46 and M26. The United States entered a period of frenzied activity during the crisis atmosphere of the Korean War, when America seemed to lag behind the Soviet Union in terms of tank quality and quantity. Testing and development cycles occurred simultaneously with production to ensure speedy delivery of new tanks. Such rapid production caused problems but

4650-641: The M1 Abrams tanks and M2 Bradley armored vehicles, and its age is making it difficult to maintain and sustain with parts becoming obsolete. Furthermore, the Army has determined that the M104 Wolverine is too costly to operate and maintain, causing its production to be suspended. Both the Army and Marine Corps are planning to replace the vehicles with the M1074 Joint Assault Bridge (JABS). The JAB also has

M60 AVLB - Misplaced Pages Continue

4800-720: The M104 Wolverine . As of 2018 the vehicle is still in service with the Army National Guard . The US Marines received their first M60A1 AVLBs in the late 1980s. They have been deployed with Marines Corps armored divisions during Operation Desert Storm in Kuwait and Iraq in 1990 and 2003 Iraq War as well as Operation Enduring Freedom in Afghanistan. As of 2009, the Marines had an inventory of 55 bridges and 37 launchers in service. The M60-based AVLB has been found to be inadequate to support

4950-670: The Newark Tank Plant in Newark, Delaware, in March 1951 to produce the M48 while Chrysler Defense Engineering and ARCOVE continued advanced production engineering (APE) to evolve the design using the T48 prototypes at the OTAC Detroit Arsenal. In May 1952 Chrysler agreed to take control of a Government-Owned and Contractor Operated (GOCO) basis of the Newark Tank plant production facility with

5100-528: The Project on Government Oversight ). PMP took issue with the tank's vulnerability, high price, reliance on flammable hydraulics, and high fuel consumption. American tank historian Steven J. Zaloga characterized American press criticism of the M1 during this time as "ill-founded". Zaloga wrote the issues uncovered by the tank trials were "not particularly serious". PMP's criticism failed to generate any serious opposition to

5250-521: The U.S. Army and the West German Bundeswehr began collaborating on a main battle tank (MBT) design that both nations would use, improving interoperability between the two NATO partners. The MBT-70 , or Kampfpanzer 70 as it was known in Germany, incorporated many new unconventional technologies across the board. Conventional tanks of the time had a crew of four, with the driver located in

5400-466: The liberation of Kuwait . The U.S. Marine Corps deployed 353 tanks, of which 277 were M60s and 76 were M1A1 (60 M1A1HA and 16 M1A1 Common). The M1A1 Common variant included adaptations for deep wading and improvements to increase commonality with the Army's Abrams. The 2nd Tank Battalion was equipped with M1A1HA Abrams borrowed from the Army. The M1A1 was superior to Iraq's Soviet -era T-54/T-55 and T-62 tanks, as well as T-72 versions imported from

5550-543: The 105 mm M68 gun, the licensed L7, and the 20 mm Bushmaster. Chrysler chose a 1,500 hp Lycoming AGT1500 gas turbine engine. GM's model was powered by a 1,500 hp diesel engine similar to that used on the American MBT-70 and XM803. Prototypes were delivered in 1976 by Chrysler and GM armed with the M68E1 105 mm gun. They entered head-to-head testing at Aberdeen Proving Ground . The testing showed that

5700-456: The 1959 end of production of the M48, the chassis of the similar M60 was used, with 400 launcher assemblies and bridge units produced from 1958 to 1963. Many of these early bridge launcher units were later exported to Israel after the conclusion of the Vietnam War. The M60 AVLB is based on the M60 or the M60A1 hulls. Initial construction of the M60 AVLB was from 1963 to 1967. Most of the hulls for

5850-718: The AVLBs through the 1970s. They were mated to M48 and M60 series hulls by Israeli Military Industries TAAS Slavin Plant. The Tagash AVLB has supported the IDF in the Yom Kippur War , 1982 Lebanon War , 2006 Lebanon War and the 2014 Israel-Gaza Conflict . The IDF continues to use the M60A1-based bridge layers except with modifications. Vehicle modifications included new all-steel Merkava tracks and drive sprockets, although some vehicles continue to use

6000-459: The Abrams and many other U.S. combat vehicles used in the conflict were fitted with Combat Identification Panels to reduce friendly fire incidents. Several Abrams tanks that were irrecoverable due to loss of mobility or other circumstances were destroyed by friendly forces, usually by other Abrams tanks, to prevent their capture. Some Abrams tanks were disabled by Iraqi infantrymen in ambushes during

6150-713: The Armor School at Fort Knox to train crewmembers and maintenance personnel. The Army concluded in January 1952 that the T42 had failed as a tank capable of combat in Europe against Soviet tanks and reached the same conclusion in November 1953 for the M48 Mod A versions. The M48A1 focused on improving the engine and the vehicle's operational range and fixing numerous mechanical problems. To cope with

M60 AVLB - Misplaced Pages Continue

6300-580: The Army to reallocate remaining funds to develop a new main battle tank. The Army began the XM815 project in January 1972. The Main Battle Tank Task Force (MBTTF) was established under Major General William Desobry . The task force prepared design studies with the technical support of Tank-automotive and Armaments Command (TACOM). TACOM began examining specific goals. To this end, a new design basis emerged in February 1973. It had to defeat any hit from

6450-607: The Congress would not approve the procurement of the M48A2 after the fiscal year 1959. However, the ongoing T95 Tank Program was progressing slowly as its new technologies were being developed. Several ideas were proposed to replace the M48A2. General Bruce C. Clarke wrapped competing and even conflicting desires in irony, observing that "We know exactly what we want. We want a fast, highly mobile, fully armored, lightweight vehicle. It must be able to swim, cross any terrain, and climb 30-degree hills. It must be air-transportable. It must have

6600-437: The Continental AV-1790-5B gasoline engine producing 704 brake horsepower coupled to an Allison CD-850-4A cross-drive transmission with 2 forward and 1 reverse ranges. The hull armor was increased to 4 in (100 mm) on the front glacis of rolled homogeneous steel. It had six roadwheel pairs per side and five return rollers, a torsion bar suspension system, and used T97E2 steel tracks. A new hemisphere-shaped turret eliminated

6750-510: The Defense Department awarded the $ 4.9 billion development contract to Chrysler. The turbine engine and cost do not appear to be the only reason for the selection of Chrysler. Chrysler was the only company that appeared to be seriously interested in tank development; the M60 had been lucrative for the company. In contrast, GM made only about 1% of its income from military sales, compared to 5% for Chrysler, and only submitted their bid after

6900-627: The Deputy Chief of Staff, Logistics (DCSLOG) submitted a proposal for a tank based on the M48A2 featuring improved firepower and a compression ignition engine and started the design development of the XM60 in September 1957. The engine deck was redesigned with two large louvered doors that replaced the complicated grill work of the rear engine decks of the M48/M48A1 hull designs. This new rear hull arrangement on

7050-422: The GM design was generally superior to Chrysler's, offering better armor protection, and better fire control and turret stabilization systems. During testing, the power packs of both designs proved to have issues. The Chrysler gas turbine engine had extensive heat recovery systems in an attempt to improve its fuel efficiency to something similar to a traditional internal combustion engine . This proved not to be

7200-426: The Gulf War in 1991, during Operation Desert Storm. The first Abrams tanks to arrive in Saudi Arabia in August 1990 in the buildup to the war were M1 and IPM1 tanks with 105 mm guns. All but two battalions of 105 mm gun Abrams tanks were replaced by M1A1 tanks prior to the American invasion in January 1991. The U.S. Army deployed a total of 1,956 M1A1s (733 M1A1, 1,233 M1A1HA) to Saudi Arabia to participate in

7350-549: The Iraqi Army only had about 40 operational Abrams left. That month, the U.S. Department of State approved the sale of another 175 Abrams to Iraq. Iranian-backed Iraqi Shiite Kata'ib Hezbollah (Hezbollah Brigades) were reported to operate M1 Abrams, and released publicity showing the tanks being transported by trucks to take part in the Battle of Mosul . It is not known whether the tanks were captured from ISIL, seized from Iraq's military, or handed over. One Iraqi-operated Abrams has been nicknamed " The Beast " after it became

7500-506: The Leopard 2. As the Abrams entered service, they operated alongside M60A3 within the U.S. military and with other NATO tanks in various Cold War exercises which usually took place in Western Europe, especially West Germany . The exercises were aimed at countering Soviet forces. Adaptations before the Gulf War (Operations Desert Shield and Desert Storm) gave the vehicle better firepower and Nuclear, Biological and Chemical (NBC) protection. The Abrams remained untested in combat until

7650-440: The M1A1s was the destruction of seven T-72s in a point-blank skirmish (less than 50 yards (46 m)) near Mahmoudiyah, about 18 miles (29 km) south of Baghdad, with no U.S. losses. This was in the face of inadequately trained Iraqi tank crews, most of whom had not fired live ammunition in the previous year due to the sanctions then in operation and made no hits at point-blank range. Following lessons learned in Desert Storm,

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7800-443: The M256 120 mm smoothbore cannon, improved armor, consisting of depleted uranium and other classified materials, and a CBRN protection system. Production of M1 and M1A1 tanks totaled some 9,000 tanks at a cost of approximately $ 4.3 million per unit. In 1990, a Project On Government Oversight report criticized the M1's high costs and low fuel efficiency in comparison with other tanks of similar power and effectiveness such as

7950-410: The M2HB took up a great deal of space in the already cramped cupola's interior. Also due to restraints in the cupola, smaller 50 round ammunition boxes were used. Development of its eventual replacement, the T9/M19 cupola of the XM60 tank was continued into 1958 and some M19 cupolas were retro-fitted to M48A5s to allow for the use of IR and daylight periscopes by the commander. Chrysler began building

8100-488: The M47's M36/T119 90 mm rifled main gun could not consistently penetrate its frontal armor, even with special armor-piercing capped (APC) or HEAT ammunition. Work was performed to address this by developing the improved T300E53 HEAT ammunition and the T137 series of hypervelocity armor-piercing discarding-sabot (HVAP-DS or simply APDS) ammunition for the M36 gun. The new APDS round could penetrate 11.1 in (280 mm) of homogeneous steel armor, angled at 30 degrees, at

8250-416: The M47s noted shot traps and lowered the vehicle's height. T48 pilot #1 was constructed by Chrysler Engineering to begin testing at the OTAC Detroit Arsenal Test Center in December 1951. Six prototypes were built in all. On 27 February 1951, shortly after the outbreak of the Korean War , the Ordnance Technical Committee Minutes (OTCM) #33791 initiated the simultaneous production and design refinement of

8400-455: The M48 by 1953, however its development was continued with the T95 Medium Tank until 1958. There were two different hulls used for the M48 series. The M48 hull had a wedge-shaped front glacis compared to the M46's rather flat design. Early Mod A hulls had smaller diameter driver's hatches. The suspension consisted of six roadwheel pairs per side with a torsion bar suspension system and five return rollers. The engine exhaust vents were located on

8550-404: The M48A1 (T48 Pilot #3) were further upgraded to the A2 hull design standard but retained their original 5 return roller configuration. The M48A2 hull design saw several modifications including a reduction from five to three return rollers per side. The suspension system was simplified, a more compact powerpack compartment and additional fuel cells, with large louvered grill access doors replaced

8700-425: The M48A1 was considered an even match for its Soviet counterpart, the T-54 and fielded to combat units in Europe. On 25 October 1954, the Army decided to amend its designation of the M48 tank. Thereafter, the tanks with the original Mod A hull design and the Chrysler-designed M1 remote-control machine gun mount attached to the tank commander's pop-up hatch would remain the 90mm gun tank M48. However, all those tanks with

8850-453: The M48A2 tank helped in cooling the engine and minimizing the infrared (heat) signature of the vehicle. The suspension system was simplified. The track tensioner arm was eliminated, modifications to the idler arm, the addition of bumper springs and friction snubbers, and a relocation of the air cleaner assembly. The number of return rollers was reduced to 3 per side. With the more compact AVI-1790-8 engine, additional fuel tanks were installed in

9000-409: The M48A2C, were powered by a gasoline engine. The M48A3 and A5 versions used a diesel engine, however, gasoline engine versions were still in use in the US Army National Guard through 1968 and by many West German Army units through 1975. Numerous examples of the M48 saw combat use in various Arab–Israeli conflicts and the Vietnam War . Beginning in 1959, most American M48A1s and M48A2s were upgraded to

9150-466: The M48A3 model. The M48 Patton-series saw widespread service with the United States and NATO until it was superseded by the M60 tank . It was widely exported. The tank's hull also became the basis for a wide variety of experimental, utility and support vehicles such as armored recovery vehicles and bridge layers. Some M48A5 models served into the mid-1980s with US Army National Guard units, and M48A3s were used as targets for weapons and radar testing into

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9300-416: The M5A2 ballistic drive and mechanical M13A3 gun data computer which integrated barrel temperature data with an M17 coincidence range finder. The rangefinder is a double image coincidence image instrument used as the ranging device of the gunner's primary direct sighting and fire control system. The gunner is provided with an M20 day periscope with a magnification of x8 and an M105D day telescopic sight with

9450-420: The M60A1 AVLB were former M60A2 Pattons converted to AVLBs from 1987 to 1996. All AVLBs were constructed at the Anniston Army Depot , Alabama under contract with General Dynamics Land Systems . The driver and commander are seated side by side in what would normally be the turret ring. Instead of a turret, launching equipment for a scissor bridge is fitted. The scissor bridge is carried in folded position on top of

9600-437: The Mod B hull (some production M48A1 tanks had the Mod B turret) and fitted with the new small turreted M1 cupola armed with a .50 caliber M2HB machine gun would be designated as the 90mm gun tank M48A1. M48A1 tanks with 5 return rollers and the ModB driver's hatch were modified to the M48A2 hull configuration. The hull's armor framing for the engine compartment was modified. In addition detachable headlights, armored boxes around

9750-421: The Optical Tracking, Acquisition and Ranging (OPTAR) rangefinder of the T95 continued into 1957. Another requirement of the T48 project was to explore the use of autoloaders for the main gun as they became available. Preliminary experiments with a loading system using the T48 turret were unsuccessful due to the limited space and the need to line up the breech with the loading system after each firing. It also

9900-462: The Patton chassis. The scissors-type bridge weights over 13 000 kg, is made of aluminum and can be deployed under armor protection in 3 to 10 minutes, and retrieved and stowed in 10 minutes to an hour depending on terrain. The Military Load Classification (MLC) 60 bridge has sufficient capacity to support the M48 and M60 families of armored vehicles. The MLC 70 bridge supports the heavier M1 Abrams family of armored vehicles. An upgraded MLC70 bridge

10050-470: The Soviet Union and Poland. Polish officials stated that no license-produced T-72 (nicknamed Lion of Babylon ) tanks were finished before destruction of the Iraqi Taji tank plant in 1991. Iraq's T-72s, like most Soviet export designs, lacked night-vision systems and then-modern rangefinders , though they did have some night-fighting tanks with older active infrared systems or floodlights . Very few M1 tanks were hit by enemy fire and none were destroyed as

10200-416: The T48 tanks at the OTAC Detroit Arsenal Test Center would be incorporated into the M48 series production vehicles as quickly as possible. T48 pilot #1 was designed and constructed by Chrysler Engineering to begin the APE design development at the OTAC Detroit Arsenal Test Center in December 1951. This tank was provisionally armed with the M36/T119 gun using a Y-shaped deflector and a muzzle brake. This gun

10350-434: The T48 tanks began in February 1952 and continued until the end of 1955. However, the perceived immediate threat of Soviet aggression in Western Europe and the ongoing Korean War impelled Army senior leadership to rush the T48 tank into series production before the inevitable bugs could be worked out of the new tank design. Instead, it was decided that any needed design changes uncovered by the continued testing and evaluation of

10500-434: The U.S. for repairs. In May 2008, it was reported that a U.S. M1 tank had also been damaged in Iraq by insurgent fire of a Soviet-made RPG-29 "Vampir", which uses a tandem-charge HEAT warhead to penetrate explosive reactive armor (ERA) as well as composite armor behind it. The U.S. considered the RPG-29 a high threat to armor and refused to allow the newly formed Iraqi Army to buy it, fearing that it would fall into

10650-438: The U.S. would select a common MBT. In reality, the U.S. Army was unwilling to choose a foreign tank unless it was obviously superior in design and cost. In any case, in evaluations the Leopard 2AV was found to meet U.S. requirements but was thought to cost more. The U.S. Army announced in January 1977 that Germany had withdrawn the tank from consideration. Having narrowly averted losing the contract, Chrysler set about improving

10800-663: The US Army Field Forces (AFF) declared the T42 medium tank unfit for production in November 1952, mainly due to serious shortcomings of its hull design. Ford's production of the M48 ended in August 1953 after a fire destroyed most of the Livonia Tank Plant. Testing and feedback from ARCOVE had uncovered the fact that the original driver's hatch design of the M48 Mod A hull's design (T48 pilots #1 and 2) tanks proved to be too small and made for an uncomfortable seating position for

10950-510: The US Government and continue production design refinement of the T48 at the OTAC Detroit Arsenal. To meet the urgent need for tanks, production contracts were also awarded to General Motors Fisher Body Division (Grand Blanc Tank Plant) and Ford Motor Company (Livonia Tank Plant) to produce the tank in Michigan starting in April 1952. Also in July 1952 the Army awarded American Locomotive Company

11100-482: The United States armored forces, including a multifuel turbine engine , sophisticated Chobham composite armor , a computer fire control system, separate ammunition storage in a blowout compartment , and NBC protection for crew safety. Initial models of the M1 were armed with a 105 mm M68 gun, while later variants feature a license-produced Rheinmetall 120 mm L/44 designated M256 . The M1 Abrams

11250-661: The armed forces of Egypt , Kuwait , Saudi Arabia , Australia , Poland and Iraq . The Abrams was first used in combat by the U.S. in the Gulf War . It was later deployed by the U.S. in the War in Afghanistan and the Iraq War , as well as by Iraq in the war against the Islamic State , Saudi Arabia in the Yemeni Civil War , and Ukraine during the Russian invasion of Ukraine . In 1963,

11400-424: The assumption that the 105 mm gun would probably be the eventual main armament." The tripartite British—American—German gun trials of 1975 produced a general agreement in the U.S. Defense Department that at some future point, a 120 mm gun of some design would be added to the XM1. Apparently anticipating this, Chrysler and GM had both made changes to their tanks during development to make them compatible with

11550-445: The basis for the M104 Wolverine heavy assault bridge. The M1A2 SEPv2 (version 2) added Common Remotely Operated Weapon Station (CROWS or CROWS II) support, color displays, better interfaces, a new operating system, better front and side armor, and an upgraded transmission for better durability. Further upgrades included depleted uranium armor for all variants, a system overhaul that returns all A1s to like-new condition (M1A1 AIM),

11700-667: The battlefield, and the varying calibers of main guns now available. Thus the caliber of the gun replaced its weight designation. For example, the M103 Heavy Tank was redesignated as the 120 mm Gun Tank M103 and the Light Tank M41 Walker Bulldog as the 76 mm Gun Tank M41 Walker Bulldog . The M47 Patton entered production in 1951 and was used by the United States Army and Marine Corps but ongoing technical and production problems kept it from serving in

11850-545: The beginning of 2003. Vulnerabilities exposed during urban combat in the Iraq War were addressed with the Tank Urban Survival Kit (TUSK) modifications, including armor upgrades and a gun shield, issued to some M1 Abrams tanks. It added protection in the rear and side of the tank and improved fighting ability and survival ability in urban environments. By December 2006 more than 530 Abrams tanks had been shipped back to

12000-408: The bridge on the far bank and continue along in support of assault forces. It can produce a limited smokescreen by dumping raw diesel fuel into the exhaust system to visually obscure the area around the vehicle. The smokescreen does not provide protection against infrared, thermal or laser detection. The vehicle does not provide full NBC protection to the crew. The vehicle itself is unarmed; however,

12150-424: The case: the engine consumed much more fuel than expected, burning 3.8 US gallons per mile (890 L/100 km). The GM design used a new variable-compression diesel design. By spring 1976, the decision to choose the GM design was largely complete. In addition to offering better overall performance, there were concerns about Chrysler's engine both from a reliability and fuel consumption standpoint. The GM program

12300-405: The chassis and the hydraulics for the launcher installed in the former driver's compartment. It is launched towards the front by means of a hydraulic launching arm. The driver has controls to launch and retrieve the bridge. The launching arm features a large bar that features as an outrigger during emplacement. After assault force vehicles have passed over the bridge, the AVLB can cross over, pick up

12450-403: The commander, gunner and loader were positioned in the turret and the driver stationed in the front center of the hull. The M48's turret consisted of a redesigned flat gun shield and standard pop-up hatch for the commander's station. The M48 Mod A turret design had smaller roof hatches for both the commander and loader. A .50 cal M2HB using a M1 remote control mount on a pedestal was available for

12600-417: The commander. When not in use, the machine gun mount could be stowed on a bracket welded to the turret roof in front of the loader. The M48's direct fire control system consisted of an M12/T41 stereoscopic rangefinder with a field of view of 5 degrees and magnification of x7.5, an azimuth indicator, an M20 gunner's periscope and a T13 super elevation actuator. Two main bearings are bolted to the mounting plate on

12750-431: The complicated grill work of the rear engine decks of the M48/M48A1 hull designs. This hull was used on newly constructed M48A2 and M48A3 tanks of the M48 series. The turret used for the M48 series was hemispherical in shape and was made from cast homogeneous steel. It had a flat gun shield and a standard pop-up styled hatch for the commander and an additional hatch for the loader's station. Early production Mod A models of

12900-602: The conclusion of World War II , the United States Ordnance Tank-Automotive Command (OTAC) drastically slowed or canceled many tank development and design programs. On 7 November 1950, the Ordnance Technical Committee mandated a change in the nomenclature for tanks in the US military. It was decided that weight designations (Light, Medium, Heavy) were no longer applicable due to changes in the way tanks were developed and employed on

13050-399: The crewmembers are typically armed with assault rifles ( M16 or M4 ), pistols, flares, and/or colored smoke grenades. The M60 AVLM carries up to two M58 Mine Clearing Line Charges mounted on the vehicle. The system consists of an M147 firing kit, an M58A3 line charge and a 5-inch MK22 Mod 4 rocket. The line charge is 350 feet long and contains five pounds per linear foot of C-4 explosive. In

13200-511: The design work to be done by the government. Under the new framework, contractors would competitively bid their own designs rather than compete solely for the right to manufacture the end product. In January 1973, the U.S. Army issued the XM1 (as the XM815 had been renamed in November 1972) request for proposals . In May 1973, Chrysler Defense and General Motors submitted proposals. Both were armed with

13350-471: The design. Expensive components were replaced with less expensive ones. Chrysler's team also negotiated lower costs from their subcontractors. The price of the redesigned tank's turret especially was decreased, but other improvements came from unexpected places, such as a $ 600 hydraulic oil reservoir replaced with a $ 25 one. Chrysler also submitted a version with a Teledyne AVCR-1360 diesel engine. Chrysler's new bid came to $ 196 million, down from $ 221 million in

13500-459: The drive sprocket at the rear and a torsion bar suspension system. Pilot #2 was built in February 1952 and also used the early Mod A design with small hatches. It was fitted with the T139/M41 90mm gun replacing the muzzle brake with a cylindrical blast deflector. A T-shaped deflector was used for production M48 tanks. This vehicle had two machine guns installed, a .30cal M1919E4 mounted coaxially to

13650-418: The driver when operating the tank with his hatch in the open position. To rectify this problem a new larger driver hatch was devised that was introduced into series production vehicles as early as possible. Also the driver's front vision block was removable and could be replaced with an infrared IR vision block. A redesigned power pack featured an AV-1790-7B gasoline engine and CD-850-4B transmission. The turret

13800-411: The driver's station to the front center and removal of the bow-mounted machine gun and its associated crew station, which was converted to safe container storage for additional main gun ammunition. The front glacis was sloped to offer much better ballistic protection than former welded and rather flat designs. An aircraft style steering wheel (a yoke ) replaced lever steering. The power pack consisted of

13950-405: The driver. T48 Pilots #1 & 2 incorporated a mechanism that dropped the three periscope heads to provide clearance for the hatch door as it swung to the right, and the driver then had to reposition the periscopes by hand once the hatch was closed again. The vehicle did not have an NBC protection system for the crew and a fording depth of approximately 1.2 m (3.9 ft). It had a crew of 4;

14100-462: The effective range of the main gun in the Iraqi tanks was less than 6,600 feet (2,000 m). This meant Abrams tanks could hit Iraqi tanks before the enemy got in range—a decisive advantage in this kind of combat. In friendly fire incidents, the front armor and fore side turret armor survived direct APFSDS hits from other M1A1s. This was not the case for the side armor of the hull and the rear armor of

14250-532: The engine compartment, increasing fuel capacity to 335 gallons. Many older model M48A1s were rebuilt to this production configuration but retained their original 5 return rollers per side. The M48A2C saw improvements for the turret implementing the Mod B turret design with larger hatches for the commander and loader. The M12 rangefinder was replaced with a full-field coincidence model along with an improved turret control system. The M13 Fire Control System (FCS) consists of

14400-498: The entire tank to be raised or lowered by the driver. The United States team was led by General Motors while the German team consisted of a consortium of firms. The collaboration between the two teams was rocky from the start, with many cultural differences and disagreements about the design hampering progress. Germany favored a tank optimized for the terrain of central Europe while the U.S. attached importance to operating anywhere in

14550-403: The event a MICLIC fails to detonate normally, it can be manually activated by time-delay fuses every few feet along its length. The modification of the AVLB into an AVLM is a temporary expedient, to employ the system the vehicle cannot be carrying a bridge. There were two bridge configurations, formally referred to as a Bridge, Armored-Vehicle Launched: Scissoring Type that were to be carried on

14700-470: The fielding of the remaining tanks. The Marines Corps however continued to use the M47 Patton . The M48A1's width proved too wide for many European tunnels, complicating rail transport. Operational readiness rates of M48-equipped units tended to be low. The tanks continued experiencing engine, transmission, track, and suspension problems, and the M12 stereoscopic rangefinder was uncomfortable to operate. However,

14850-540: The future use of IR vision blocks by the driver. It also had 5 return rollers, 6 roadwheel pairs per side with the drive sprocket at the rear and a torsion bar suspension system. The Mod B turret also had larger hatches for the commander and loader. An additional three hulls were constructed (T48 pilots 4 through 6) in 1953. These tanks were used into 1955 for the component development of the M48A2 production tanks including fire control systems, turret cupolas, suspension configurations and powerpacks . At least one of these hulls

15000-479: The future. And because the Army's other tanks, the M60 and the upgraded M48 , as well as the tanks of virtually every other NATO nation, used the 105 mm gun, mounting that gun on the XM1 promised to increase standardization within the alliance. Moreover, the continuing development of the new ammunition for the XM1 automatically upgraded every other gun in NATO. For all of these reasons, the XM1's development proceeded "on

15150-725: The hull. In the MBT-70, the loader crewmember would be replaced by a mechanical autoloader and the driver would be located inside the NBC-protected turret with the other two crewmembers. Like the M60A2 MBT and M551 Sheridan light tank then under development, the MBT-70 was armed with a 152 mm gun-launcher that, in addition to firing conventional ammunition, would also fire the Shillelagh missile . A hydropneumatic suspension provided improved cross-country ride quality and also allowed

15300-531: The immediate replacement of the M48A2 as well as better quality control. Under the ARCOVE's "single, efficient producer" model, Defense Secretary Charles Erwin Wilson directed the Army to reduce the number of contractors producing each model of tank. In a new round of production bids for the M48A2, General Motors underbid Chrysler, and in September 1953 Army Secretary Robert T. Stevens awarded GM's Fisher Body division

15450-459: The importance given to rapidly equipping combat units with new tanks precluded detailed testing and evaluation prior to its quantity production. Notable among these were the T42 , T69 and T48 projects as well as continuing to pursue further improvements to the M47. Compromise was inevitable, but not always welcomed, as General Bruce C. Clarke ironically observed: "We know exactly what we want. We want

15600-574: The insurgents' hands. Between 2010 and 2012 the U.S. supplied 140 refurbished M1A1 Abrams tanks to Iraq. In mid-2014, they saw action when the Islamic State of Iraq and the Levant (ISIL or Islamic State) launched the June 2014 Northern Iraq offensive . During three months, about one-third of the Iraqi Army's M1 tanks had been damaged or destroyed by ISIL and some were captured by opposing forces. By December 2014,

15750-473: The invasion. Some troops employed short-range anti-tank rockets and fired at the tracks, rear and top. Other tanks were put out of action by engine fires when flammable fuel stored externally in turret racks was hit by small arms fire and spilled into the engine compartment. By March 2005, approximately 80 Abrams tanks had been forced out of action by enemy attacks; 63 were shipped back to the U.S. for repairs, while 17 were damaged beyond repair with 3 of them at

15900-495: The lack of range, an add-on modification allowed the use of 4 external jettisonable 55 US gal (210 L) fuel drums of MOGAS (motor gasoline) that was mounted to the rear deck, extending the range to 135 mi (217 km). This proved very unpopular with tank crews and operational range remained unsatisfactory. Further ARCOVE changes included a desire for the commander to observe and operate his weapons station while remaining under armor protection. At this same time

16050-408: The left of the main gun and a .50cal M2HB mounted on the commander's cupola. The full image stereoscopic T46E1/M12 rangefinder was placed in the central section of the turret. Pilot #3 was constructed in November 1952 and used the Mod B hull and turret designs with a simplified, larger diameter hatch that was easier for the driver to operate. Also the front vision block was removable and allowed for

16200-642: The lone working tank when taking back the town of Hit in April 2016, destroying enemy fighting positions and IED emplacements. In October 2017, Abrams were used by the Iraqi security forces and the Popular Mobilization Forces (also called Al-Hashd al-Shaabi) in assaults against the Kurdistan Regional Government Peshmerga in the town of Altun Kupri (also called Prde). It was claimed by Kurdish commanders that at least one Abrams

16350-413: The mid-1990s. Many M48s remain in service in countries other than the US. Most of these have been modified and their firepower, mobility and protection upgraded to increase their combat effectiveness on the modern battlefield. As of 2015, Turkey is the largest operator with over 750 units in service, Taiwan is second with approximately 500 upgraded variants, and Greece is third with 390 in service. After

16500-425: The new round of bidding. In September 1954 the Army awarded Chrysler an exclusive $ 160.6 million contract to restart production. In November 1955 the Army awarded American Locomotive Company a $ 73 million contract to begin producing 600 M48A2s the next year at the Schenectady Tank Plant, New York. However Alco opted to wrap up its tank business when its contract ended in July 1956. In May the Army awarded Chrysler,

16650-410: The new tank at 58 short tons (53 t). The original goal of keeping weight under 50 short tons (45 t) was abandoned. At the time, the Pentagon's procurement system was beset with problems being caused by the desire to have the best possible design. This often resulted in programs being canceled due to cost overruns, leaving the forces with outdated systems, as was the case with the MBT-70. There

16800-424: The new tank have a turbine. Defense Secretary Rumsfeld heard arguments from both parties in the afternoon. The Army team spent the night writing briefs and presented them to Rumsfeld the next morning, who then announced a four-month delay. Within days, GM was asked to present a new design with a turbine engine. According to Assistant Secretary for Research and Development Ed Miller, "It became increasingly clear that

16950-531: The new tank, designating the production tanks as the 90mm Gun Tank M48. The Army planned to produce some 9,000 M48s within three years of development. Chrysler Corporation became the principal producer of the tank. Expected production and teething troubles led to the creation of integrating committees to coordinate tank and component development. These Army Combat Vehicle (ARCOVE) committees included military and industrial representatives who provided early warning of defects and recommended remedies. Testing trials of

17100-636: The only bidder, a $ 119 million contract to continue production of the M48A2 at the Delaware Tank Plant. In December 1955 Chrysler took on orders initially intended for the American Locomotive after Alco opted production cutbacks to its tank program and became the only manufacturer of the tank by the end of 1956. During the ARCOVE Questionmark III conference in June 1957 it was predicted that

17250-419: The only solution which would be acceptable to Clements and Currie was the turbine... It was a political decision that was reached, and for all intents and purposes that decision gave the award to Chrysler since they were the only contractor with a gas turbine." In the meantime, in September 1976 three West German Leopard 2 AV prototypes were belatedly sent to Aberdeen for comparison testing. Germany had signed

17400-457: The original T142 track. Due to the growing use of a number of trenches in fortifications and the greater number of natural narrower obstacles rather than larger ones, a tandem assembly bridge called the Tzmed or tandem was engineered. Two bridge sections can be fitted to any M60 AVLB system without any modification to the launcher. The main advantage to an up-and-out system compared to a horizontal system

17550-420: The original proposal. GM's proposal replaced the diesel engine with an AGT1500 turbine and integrated a turret capable of mounting either the 105 mm or 120 mm gun. Cost growth pushed the tank bid to $ 232 million from $ 208 million. Although the GM team had successfully integrated the turbine, Baer was more impressed by the cost savings introduced by the Chrysler team's redesign. On 12 November 1976,

17700-565: The program, which maintained strong support from Congress and the Pentagon. Responding to some of the alleged issues with the tank in King of the Killing Zone (1989), journalist Orr Kelly wrote that "The truth is close to the opposite." Kelly said the program "ranks as one of the Army's best managed", producing a tank in "a remarkably short time" while avoiding " gold-plating " and utilizing effective competition. Low rate initial production (LRIP) of

17850-413: The roof of the tank turret to support the range finder on steel radial ball bearings. A parallel gun linkage between the gun trunnion and the range finder assures that the line of sight of the range finder reproduces the exact motion of the gun in elevation. A .30 caliber M1919E4 machine gun was coaxially mounted to the main gun's left and was operated by the gunner. An M12 full field optical range finder

18000-405: The service and its contractors to favor the Army's standard M68 105 mm gun over Germany's 120 mm Rheinmetall Rh-120 smoothbore gun for the XM1. To begin with, the 105 mm gun was "the smallest, lightest, and least costly gun adequate for the job." Indeed, new kinetic energy ammunition for the weapon then under development by the Army promised to extend the gun's usefulness well into

18150-451: The taillights, newly redesigned mudguards, an updated fuel delivery system and a tank infantry phone were added. The concurrent testing of the T48 and production of the M48 was the source of widespread debate among Congressional Budget Oversight committees. The Bureau of the Budget believed that the Army was not progressing with sufficient speed in its tank modernization program and recommended

18300-581: The tank commander to aim and fire his weapon while remaining under armor protection via a remote controlled M2HB machine gun, however the commander had to open the cupola hatch and expose his head to reload or service the machine gun due to the limited headroom. These cupolas had a small rearward opening hatch and a single, non-removable vision block. They were designed by Aircraft Armaments Incorporated . Because of its smaller turret roof hatch opening those M1 cupolas retro-fitted to early production M48 Mod A turrets used an adaptor ring. The M1E1 cupola design used

18450-405: The tank commander's weapon on a pedestal, which allowed him to fire the .50 caliber (12.7 mm) M2HB machine gun from within the vehicle's turret. It used a 100-round ammunition box and could also be employed manually by the commander. However, servicing and reloading of the weapon required the tank commander to open his roof hatch and expose his head and upper torso. This remote-controllable mount

18600-451: The tank design, the United States and Germany ended their MBT-70 partnership in 1970. The U.S. Army began work on an austere version of the MBT-70, named XM803 . Systems were simplified or eliminated altogether and the unreliable autoloader was improved. These changes were ultimately insufficient to allay concerns about the tank's cost. Congress canceled the XM803 in December 1971 but permitted

18750-482: The top of the rear deck. There was a dual compensating idler arm at the front, and dual auxiliary track tension wheels behind the last road wheels, using the T97E2 track assembly. The drive sprocket was located at the rear of the hull. Shock absorbers were mounted at the first two and last roadwheel arms. This hull design was manufactured for the original M48 and M48A1 versions of the M48 series. Many Mod B hull designs used for

18900-472: The turret had somewhat smaller diameter hatches. The gunner was provided with an M37 .30 cal machine gun with 5,900 rounds of ammunition. During WWII and the Korean War, most tanks used a direct sighting system where the gun sights and rangefinders were slaved directly to the gun's barrel but its long range accuracy depended upon the focusing abilities of the individual gunner. There are two basic types of optical rangefinders , stereoscopic and coincidence. With

19050-699: The turret, as both areas were penetrated on at least two occasions by unintentional strikes by depleted uranium ammunition during the Battle of Norfolk . During the Waco siege in 1993, two M1A1 Abrams tanks were borrowed from the military and deployed by the FBI against the Branch Davidians . The M1A2 was a further improvement of the M1A1, with a commander's independent thermal viewer, weapon station, position navigation equipment, and

19200-495: The vehicle was approved in May 1979. In February 1982, General Dynamics Land Systems Division (GDLS) purchased Chrysler Defense, after Chrysler built over 1,000 M1s. A total of 3,273 M1 Abrams tanks were produced during 1979–1985 and first entered U.S. Army service in 1980. Production at the government-owned, GDLS-operated Lima Army Tank Plant in Lima, Ohio , was joined by vehicles built at

19350-525: The war. Of the nine Abrams tanks destroyed, seven were destroyed by friendly fire and two intentionally destroyed to prevent capture by the Iraqi Army. No M1s were lost to enemy tank fire. Some others took minor combat damage, with little effect on their operational readiness. The M1A1 could kill other tanks at ranges in excess of 8,200 feet (2,500 m). This range was crucial in combat against previous generation tanks of Soviet design in Desert Storm, as

19500-458: The world. The Germans had reservations about the Shillelagh missile and developed a 120 mm high-velocity gun as an alternative. Perhaps the most contentious disagreement, never fully resolved, concerned the measurement system to be used in drafting. Germany became concerned with the excessive weight of the tank. In light of growing costs, delays and overall uncertainty as to the soundness of

19650-408: Was a dual compensating idler arm at the front, and dual auxiliary track tension wheels behind the last road wheels, as had the preceding M46 and M47 tanks. The M48 used the new 28 in (0.71 m) wide T97E2 track assembly. It had hydraulic shock absorbers mounted on the first, second and sixth roadwheel pairs (opposite of the M46 and M47). The bow mounted machine gun and its related crew station

19800-407: Was a strong movement within the Army to get a new design within budget to prevent the MBT-70 experience from repeating itself. For the new design, the Army set the design-to-unit cost at no more than $ 507,790 (equivalent to $ 3,699,000 in 2023). The Pentagon's approach to control of research and development was modified with the XM1. Previous acquisition strategy called for a significant amount of

19950-629: Was also exported to a handful of nations that also used the Patton series of tanks. Both the M48 AVLB and the M60 AVLB variants were deployed to Vietnam . During the Cold War, the M60A1 AVLB was deployed to West Germany with US Army Combat Engineer units in support of NATO , notably during annual REFORGER exercises through 1991. The US Army retired the M60 AVLB from combat use in 2003 and has been superseded by

20100-676: Was also slightly cheaper overall at $ 208 million compared to $ 221 million for Chrysler. In July 1976, the Army prepared to inform Congress of the decision to move ahead with the GM design. All that was required was the final sign-off by the U.S Secretary of Defense , Donald Rumsfeld . On 20 July 1976, United States Secretary of the Army Martin Hoffmann and a group of generals visited Deputy Defense Secretary Bill Clements and Director of Defense Research and Engineering Malcolm Currie on their decision. They were surprised when Clements and Currie criticized their decision and demanded that

20250-471: Was armed with the license-built M68A1 version of the 105 mm Royal Ordnance L7 gun. The tank featured the first-of-its-kind Chobham armor . The M1 Abrams was the first to use this advanced armor. It consisted of an arrangement of metal and ceramic plates. An improved model called the IPM1 was produced briefly in 1984 and contained upgrades to armor and other small improvements. A number of considerations had led

20400-402: Was canceled, the Army has opted to continue maintaining and operating the M1 series for the foreseeable future by upgrading optics, armor, and firepower. The M1 Abrams entered service in 1980 and serves as the main battle tank of the United States Army and formerly of the U.S. Marine Corps (USMC) until the decommissioning of all USMC tank battalions in 2021. The export modification is used by

20550-499: Was designated as the .50 Caliber Machine Gun Mount, M1 and designed by Chrysler Defense Engineering. By October 1954, the Army decided to amend the design of the tank by installing a cupola. During the production of M48s it was modified several times resulting in a wide mix of cupola styles among individual tanks. Afterwards it was renamed as the Cupola, Tank Commander's Caliber .50 Machine Gun, M1. The new tank commander cupola would allow

20700-638: Was destroyed by the Peshmerga. Canada and Denmark deployed Leopard 1 and 2 MBTs that were specially modified to operate in the relatively flat and arid conditions of southwestern Afghanistan. In late 2010, at the request of Regional Command Southwest , the U.S. Marine Corps deployed a small detachment of 14 M1A1 Abrams tanks from Delta Company, 1st Tank Battalion , 1st Marine Division (Forward), to southern Afghanistan in support of operations in Helmand and Kandahar provinces. Saudi Abrams tanks saw service in

20850-455: Was determined that the tankers at Fort Bliss had discovered that they could throw the vehicle directly from acceleration into reverse, a tactically advantageous maneuver called the "bow tie". Chrysler resolved this by installing a device that prevented this. The problems found during testing were easily surmounted. Critics of the M1 program emerged in the early 1980s, particularly the newly formed Project on Military Procurement (PMP) (later renamed

21000-521: Was developed for the AVLB during the 1990s at Anniston Army Depot (ANAD). The bridge conversion added stronger materials. After a round of testing in 2012, the MLC 70 was reclassified to the MLC 85. 217 of these bridges were in U.S. inventory as of 2017. Since its introduction in service in 1963, the M60 AVLB has supported the armored forces of the US Army and Marine Corps in many conflicts and military exercises. It

21150-474: Was developed from the failed joint American- West German MBT-70 project that intended to replace the dated M60 tank . There are three main operational Abrams versions: the M1, M1A1 , and M1A2 , with each new iteration seeing improvements in armament, protection, and electronics. The Abrams was to be replaced in U.S. Army service by the XM1202 Mounted Combat System , but because that project

21300-570: Was dropped from consideration for use on the M48 but was further developed on the T69 tank as the 90 mm T178 gun. It was fitted with an eight-round auto-loader system mounted in an oscillating turret. ARCOVE also involved the Ordnance Department with the goal of improving the 90 mm gun and its ammunition. The Army expected difficulties in engagements with the Soviet IS-3 heavy tank , since

21450-399: Was eliminated thus providing more ammunition storage for the main gun. The driver's station was moved to the front center of the hull. The steering controls were redesigned. A large aircraft-styled steering wheel (replacing the wobble stick control of the M46 and M47) and placing the transmission range selector on the floor to the driver's right. Mod A hulls had a small oval overhead hatch for

21600-430: Was envisioned to be fitted to the hull. It was also desired that a turret be constructed using this special armor. The OTAC and Carnegie Institute of Technology began development of the armor in November 1952 at Fort Belvoir VA as Project TT2-782/51. This composite armor offered protection against HEAT, HESH , and HE rounds. Its overall slow development limited its use to the T48 and was dropped from consideration in

21750-447: Was fitted with experimental silica glass composite armor panels. In conjunction with the development of the T48 project there was some discussion regarding armor. The weight of conventional armored steel needed to provide protection against the emerging large-caliber high-velocity main guns and improved APDS kinetic energy penetrators was making its continued use impractical. Composite applique armor panels made with fused silica glass

21900-734: Was fitted with the M1 cupola that enclosed the M2HB machine gun. Cupolas fitted on those tanks with early production Mod A turrets used an adapter ring. In April 1953, the Army standardized this configuration as the 90mm Gun Tank M48A1 Patton and originally applied this designation to both the early Mod A hull design and the Mod B hulls currently in series production. Between April 1952 and December 1954, nearly 7,000 M48s and M48A1s were produced, with production contracts for an additional 2,500 tanks to be built through 1956. Army units in Europe immediately received 2,120 of these early M48A1 tanks, but correction of ARCOVE defects discovered after production delayed

22050-453: Was found to be prone to snagging brush. It was replaced with a T-shaped model early in production. These early M48 tanks suffered from engine, transmission, track, and suspension problems. The first production vehicles suffered from excessive oil consumption and engine failures after only 1,000 mi (1,600 km). The gasoline engine managed only 0.33 mpg US (0.14 km/L), limiting range to 75 miles (121 km). The M12/T41 rangefinder

22200-416: Was not used for production M48 tanks. It used the Mod A hull and turret designs with smaller diameter crew hatches. The driver's hatch incorporated a mechanism that dropped his three periscope heads to provide clearance for the hatch door as it swung to the right, and the driver then had to reposition the periscopes by hand once the hatch was closed again. It had 5 return rollers, 6 roadwheel pairs per side with

22350-534: Was too fragile and often broke. Army Field Forces (AFF) found these tanks to be unsuitable for combat use in Europe and was regulated to limited use by US Army CONUS units until numerous shortcomings were corrected. Furthermore, some 120 hulls were found to have insufficient hull armor protection. These were denoted as the M48C and relegated by the Continental Army Command (CONARC) for non-ballistic training use by

22500-461: Was used, the same as the M47. The tank was not fitted with any night fighting or computerized fire control systems. Some early production M48s used a Y-shaped blast deflector on the barrel and carried 53 rounds. Eight ready rounds were stored in the left side of the turret bustle for the loader, the rest were stored inside safe containers in the hull. Tank crews complained that the Y-shaped fume extractor

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