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126-622: Marquis Victor Cooper (March 11, 1982 – March 2009, missing, presumed dead) was an American professional football linebacker in the National Football League (NFL). He was selected by the Tampa Bay Buccaneers in the third round of the 2004 NFL draft . Cooper had also played for the Minnesota Vikings , Pittsburgh Steelers , Seattle Seahawks , Jacksonville Jaguars and Oakland Raiders . He played college football at

252-479: A death certificate in civil court. On March 25, 2009, a report was released based on a Florida Fish and Wildlife Conservation Commission investigation into the capsizing; the investigation included interviews with Schuyler (the survivor) and an inspection of the boat. The report concluded the following: The conclusions were accompanied by additional details from the Schuyler interviews. According to Schuyler, after

378-403: A halftime period, and the first and third quarters are followed by a short break. Before the game starts, the referee and each team's captain meet at midfield for a coin toss . The visiting team can call either "heads" or "tails"; the winner of the toss chooses whether to receive or kick off the ball or which goal they wish to defend. They can defer their choice until the second half. Unless

504-459: A 'hydrostatic release'. All automatic life-jackets can be fired manually if required. Regardless of whether manually or automatically triggered, a pin punctures the cartridge/canister and the CO 2 gas escapes into the sealed air chamber. However, there is a chance that these water pressure activated inflation devices do not inflate the life jacket if a person is wearing waterproof clothing and falls into

630-401: A 10-yard-long chain between them, are used to measure for a first down. The chain crew stays on the sidelines during the game, but if requested by the officials they will briefly bring the chains on to the field to measure. A typical chain crew will have at least three people—two members of the chain crew will hold either of the two sticks, while a third will hold the down marker. The down marker,

756-525: A PAT attempt or successful field goal, the scoring team must kick the ball off to the other team. A safety is scored when the ball carrier is tackled in the carrier's own end zone. Safeties are worth two points, which are awarded to the defense. In addition, the team that conceded the safety must kick the ball to the scoring team via a free kick . Football games are played on a rectangular field that measures 120 yards (110 m) long and 53 + 1 ⁄ 3 yards (48.8 m) wide. Lines marked along

882-696: A buoyancy compensator, which has an inflatable gas chamber. The amount of gas can be increased or decreased to enable the diver to ascend, descend or maintain neutral buoyancy at a given water depth and to provide positive buoyancy in an emergency to bring the diver to the surface or keep the diver at the surface. Specialized life jackets include shorter-profile vests commonly used for kayaking (especially playboating ), and high-buoyant types for river outfitters and other whitewater professionals. PFDs which include harnesses for tethered rescue work ('live-bait rescue') and pockets or daisy-chains (a series of loops created by sewing flat nylon webbing at regular intervals for

1008-464: A diver's drysuit provides a degree of flotation, in most maritime countries they are not formally considered by regulatory agencies as approved lifesaving devices or as PFDs. It is possible for an incapacitated person in the water to float face-down while wearing only a wet suit or a dry suit since they are not designed to serve as lifesaving devices in the normal understanding of that term. The Mark 10 Submarine Escape Immersion Equipment (SEIE) suit

1134-453: A field goal instead. A group of officials, the chain crew, keeps track of both the downs and the distance measurements. On television, a yellow line is electronically superimposed on the field to show the first down line to the viewing audience. There are two categories of kicks in football: scrimmage kicks, which can be executed by the offensive team on any down from behind or on the line of scrimmage, and free kicks. The free kicks are

1260-765: A free agent in the 2008 offseason. Cooper was signed by the Oakland Raiders on November 5, 2008, after linebacker Robert Thomas was placed on injured reserve . On March 1, 2009, 10 days before Cooper's 27th birthday, the U.S. Coast Guard reported that a 21-foot fishing boat was missing off the Gulf Coast near Clearwater, Florida . The boat was carrying four passengers: Cooper, Corey Smith , and two former University of South Florida football players, Nick Schuyler and Will Bleakley. The four men left Clearwater Pass on February 28 at 6:30 a.m. and were expected to return later that night. The Coast Guard began searching for

1386-457: A group of Princeton players realized that, as the snap was uncontested, they could now hold the ball indefinitely to prevent their opponent from scoring. In 1881, in a game between Yale and Princeton, both teams used this strategy to maintain their undefeated records. Each team held the ball, gaining no ground, for an entire half, resulting in a 0–0 tie. This "block game" proved extremely unpopular with both teams' spectators and fans. A rule change

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1512-533: A large stick with a dial on it, is flipped after each play to indicate the current down and is typically moved to the approximate spot of the ball. The chain crew system has been used for over 100 years and is considered an accurate measure of distance, rarely subject to criticism from either side. Football is a full-contact sport, and injuries are relatively common. Most injuries occur during training sessions, particularly ones that involve contact between players. To try to prevent injuries, players are required to wear

1638-543: A letter to the Naval Chronicle, dated February 1802, Abraham Bosquet proposed issuing Royal Navy Ships with "strong canvas bags of dimensions, when filled with cork shavings, equal to about that of a bed bolster, coiled in manner like a collar, and sufficiently wide for the head and shoulders to pass through." In 1804, a cork life jacket was available for sale in The Sporting Magazine . In 1806, Francis Daniel,

1764-536: A lifejacket – a privately owned Macintosh Life Preserver and seems to have got ashore fairly easily." It was not until lifesaving services were formed that the personal safety of lifeboat crews heading out in pulling boats in generally horrific sea conditions was addressed. The modern life jacket is generally credited to the Inspector of Lifeboats at the Royal National Lifeboat Institution in

1890-408: A long circumference of 28 to 28 + 1 ⁄ 2 inches (71 to 72 cm), and a short circumference of 21 to 21 + 1 ⁄ 4 inches (53 to 54 cm). In college and high school play the ball has a long axis of 10 + 7 ⁄ 8 to 11 + 7 ⁄ 16 inches (27.6 to 29.1 cm), a long circumference of 27 + 3 ⁄ 4 to 28 + 1 ⁄ 2 inches (70 to 72 cm), and

2016-401: A medical complication such as a seizure, or become unconscious. Most life jackets on the market are designed with foam that wraps around the animal's torso and neck. They provide a basic amount of buoyancy for a dog, but may not provide enough support for the head. They are not ideal for use with heavy dogs. However, they often incorporate a grab handle, which may help to hoist the dog back into

2142-420: A minimum of 10 feet (3.0 m) on high school fields. Goal posts are padded at the base, and orange ribbons are normally placed at the tip of each upright as indicators of wind strength and direction. The football itself is a prolate spheroid leather ball, similar to the balls used in rugby or Australian rules football . To contain the compressed air within it, a pig's bladder was commonly used before

2268-496: A modified scoring system. These schools formed the Intercollegiate Football Association , although Yale did not join until 1879. Yale player Walter Camp , now regarded as the "Father of American Football", secured rule changes in 1880 that reduced the size of each team from 15 to 11 players and instituted the snap to replace the chaotic and inconsistent scrum . While the game between Rutgers and Princeton

2394-506: A pair of air cells (bladders) that can be inflated by triggering the release of carbon dioxide gas from a canister—one for each cell. Alternately, the cells can be inflated "orally", that is by blowing into a flexible tube with a one-way valve to seal the air in the cell. Life jackets must also be supplied on commercial seafaring vessels, be accessible to all crew and passengers, and be donned in an emergency. Flotation devices are also found in near water-edges and at swimming pools. They may take

2520-474: A pass hits the ground without a player having caught it. A forward pass can be legally attempted only if the passer is behind the line of scrimmage; only one forward pass can be attempted per down. As in rugby, players can also pass the ball backwards at any point during a play. In the NFL, a down also ends immediately if the runner's helmet comes off. The offense is given a series of four plays, known as downs . If

2646-548: A physician working at Wapping, exhibited an inflatable life preserver, mounting a demonstration in which a number of suitably equipped men jumped into the Thames below Blackfriars Bridge , and variously played musical instruments, smoked pipes, discharged guns and drank wine, as the tide took them upstream. Daniel pursued his idea for some years, by his own account receiving a gold medal from the Royal Society of Arts after surrendering

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2772-583: A player being paid to participate in a game of American football , although many athletic clubs in the 1880s offered indirect benefits, such as helping players attain employment, giving out trophies or watches that players could pawn for money, or paying double in expense money. Despite these extra benefits, the game had a strict sense of amateurism at the time, and direct payment to players was frowned upon, if not prohibited outright. Over time, professional play became increasingly common, and with it came rising salaries and unpredictable player movement, as well as

2898-427: A quarter ends, play continues until the down is completed. If certain fouls are committed during play while time has expired, the quarter may be extended through an untimed down . Games last longer than their defined length due to play stoppages—the average NFL game lasts slightly over three hours. Time in a football game is measured by the game clock. An operator is responsible for starting, stopping and operating

3024-456: A rectangular field with goalposts at each end. The offense , the team with possession of the oval-shaped football , attempts to advance down the field by running with the ball or throwing it , while the defense , the team without possession of the ball, aims to stop the offense's advance and to take control of the ball for themselves. The offense must advance the ball at least ten yards in four downs or plays; if they fail, they turn over

3150-494: A round ball. An 1875 Harvard–Yale game played under rugby-style rules was observed by two Princeton athletes who were impressed by it. They introduced the sport to Princeton, a feat the Professional Football Researchers Association compared to "selling refrigerators to Eskimos ". Princeton, Harvard, Yale, and Columbia then agreed to intercollegiate play using a form of rugby union rules with

3276-436: A secondary signal. Women can serve as officials; Sarah Thomas became the NFL's first female official in 2015. The seven officials (of a standard seven-man crew; lower levels of play up to the college level use fewer officials) on the field are each tasked with a different set of responsibilities: Another set of officials, the chain crew , are responsible for moving the chains. The chains, consisting of two large sticks with

3402-403: A separate sport from rugby, and the resulting five-yard lines added to the field to measure distances made it resemble a gridiron in appearance. Other major rule changes included a reduction of the field size to 110 by 53 + 1 ⁄ 3 yards (100.6 m × 48.8 m) and the adoption of a scoring system that awarded four points for a touchdown, two for a safety and a goal following

3528-671: A set of equipment. At a minimum players must wear a football helmet and a set of shoulder pads , but individual leagues may require additional padding such as thigh pads and guards, knee pads, chest protectors, and mouthguards . Most injuries occur in the lower extremities, particularly in the knee, but a significant number also affect the upper extremities. The most common types of injuries are strains , sprains , bruises , fractures , dislocations , and concussions . Flotation device PFDs are commonly worn on small watercraft or other locations where accidental entry into deep water may occur in order to provide immediate support for

3654-410: A short circumference of 20 + 3 ⁄ 4 to 21 + 1 ⁄ 4 inches (53 to 54 cm). Football games last for a total of 60 minutes in professional and college play and are divided into two halves of 30 minutes and four quarters of 15 minutes. High school football games are 48 minutes in length with two halves of 24 minutes and four quarters of 12 minutes. The two halves are separated by

3780-419: A single air chamber or a pair of (twin or double) sealed air chambers constructed of coated nylon (sometimes with a protective outer encasing of heavier, tougher material such as vinyl ), joined, and buckled with a side release buckle . For use aboard ships they may be constructed of foam. Twin air chambers provide for redundancy in the event of one of the air chambers leaking or failing to "fire", for example if

3906-492: A survival vest, bulletproof vest/body armor, equipment harness, rappelling harness, or parachute harness, and the use of ballistic nylon cloth to protect pressurized CO 2 canisters used for inflating the vest from injuring the wearer if struck by a round from a firearm. The ballistic cloth keeps the fragments from the canister from becoming shrapnel injurious to the user. Life jackets or life vests are mandatory on airplanes flying over water bodies, in which case they consist of

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4032-416: A touchdown , and five for a goal from the field . Additionally, tackling below the waist was legalized, and a static line of scrimmage was instituted. Despite these new rules, football remained a violent sport. Dangerous mass-formations like the flying wedge resulted in serious injuries and deaths. A 1905 peak of 19 fatalities nationwide resulted in a threat by President Theodore Roosevelt to abolish

4158-444: A user with the necessary buoyancy. They are also designed for minimal maintenance and as they are only constructed from foam and can be mass-produced inexpensively, making them one of the most common forms of PFDs. Some buoyancy aids also come designed especially for children and youth. These vests may include one or two understraps to be worn between the legs of the wearer and also a headrest flap. The understraps are designed to keep

4284-676: A variety of styles and are generally more comfortable and less bulky than traditional foam vests. There are also life vests made especially for women. The air chambers are always located over the breast, across the shoulders and encircle the back of the head. They may be inflated by either self-contained carbon dioxide cartridges activated by pulling a cord , or blow tubes with a one-way valve for inflation by exhalation . Some inflatable life jackets also react with salt or fresh water, which causes them to self-inflate. The latest generation of self-triggering inflation devices responds to water pressure when submerged and incorporates an actuator known as

4410-403: A vehicle cabin. Upon surfacing, the person then inflates the device, orally or by triggering the gas canister release mechanism. Most commercial passenger life jackets are fitted with a plastic whistle for attracting attention. It has a light which is activated when in contact with water. Quality life jackets always provide more buoyancy than offered by the buoyancy aids alone. The positioning of

4536-460: Is a sport in which two competing teams vie for control of a ball, which can be kicked through a set of goalposts or run into the opponent's goal area to score points. What is considered to be the first American football game was played on November 6, 1869 , between Rutgers and Princeton , two college teams. They consisted of 25 players per team and used a round ball that could not be picked up or carried. It could, however, be kicked or batted with

4662-425: Is called on the offense. There are two main ways the offense can advance the ball: running and passing . In a typical play, the center passes the ball backwards and between their legs to the quarterback in a process known as the snap . The quarterback then either hands the ball off to a running back, throws the ball, or runs with it. The play ends when the player with the ball is tackled or goes out-of-bounds or

4788-437: Is caught or recovered behind the line of scrimmage. If it is touched or recovered by the kicking team beyond this line, it becomes dead at the spot where it was touched. The kicking team is prohibited from interfering with the receiver's opportunity to catch the ball. The receiving team has the option of signaling for a fair catch , which prohibits the defense from blocking into or tackling the receiver. The play ends as soon as

4914-563: Is commonly considered the first American football game, several years prior in 1862, the Oneida Football Club formed as the oldest known football club in the United States. The team consisted of graduates of Boston's elite preparatory schools and played from 1862 to 1865. The introduction of the snap resulted in an unexpected consequence. Before the snap, the strategy had been to punt if a scrum resulted in bad field position. However,

5040-644: Is intended to allow submariners to escape from much deeper depths than currently possible with the Steinke hood . Some United States Navy submarines already have the system, with an ambitious installation and training schedule in place for the remainder of the fleet. Because it is a full-body suit, the Mark 10 provides thermal protection once the wearer reaches the surface, and the Royal Navy has successfully tested it at 180 metres (600 ft) depths. Scuba divers commonly wear

5166-403: Is known as a two-point conversion . In general, the extra point is almost always successful, while the two-point conversion is a much riskier play with a higher probability of failure; accordingly, extra point attempts are far more common than two-point conversion attempts. A field goal (FG), worth three points, is scored when the ball is place kicked or drop kicked through the uprights and over

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5292-531: Is often sewn to the fabric used to construct life jackets and PFDs to facilitate a person being spotted in darkness when a search light is shone towards the wearer. In the US, federal regulations require all persons under the age of 13 to wear a life jacket (PFD) when in a watercraft under 12 meters long. State regulations may raise or lower this number and must be followed when in that state's jurisdiction. Buoyancy aids are designed to allow freedom of movement while providing

5418-407: Is responsible for all kicking plays. The special teams unit of the team in control of the ball tries to execute field goal (FG) attempts, punts , and kickoffs , while the opposing team's unit will aim to block or return them. Three positions are specific to the field goal and PAT (point-after-touchdown) unit: the placekicker (K or PK), holder (H), and long snapper (LS). The long snapper's job

5544-421: Is to block members of the defensive line from tackling the ball carrier on running plays or sacking the quarterback on passing plays. The leader of the offensive line is the center, who is responsible for snapping the ball to the quarterback, blocking, and for making sure that the other linemen do their jobs during the play. On either side of the center are the guards (G), while tackles (T) line up outside

5670-437: Is to snap the football to the holder, who will catch and position it for the placekicker. There is not usually a holder on kickoffs, because the ball is kicked off a tee; however, a holder may be used in certain situations, such as if wind is preventing the ball from remaining upright on the tee. The player on the receiving team who catches the ball is known as the kickoff returner (KR). The positions specific to punt plays are

5796-482: Is unable to swim to safely enter water, or as assistance for activities such as water skiing . PFDs are available in different sizes to accommodate variations in body weight . Designs differ depending on wearing convenience, the activities and conditions they are designed to be used in and the level of protection the wearer needs. There are three main types of PFDs: life jackets, buoyancy aids and survival suits ; PFDs are most often constructed out of foam pieces, with

5922-756: The Bowl Championship Series (BCS) in 1997. The BCS arrangement proved to be controversial , and was replaced in 2014 by the College Football Playoff (CFP). A football game is played between two teams of 11 players each. Playing with more on the field is punishable by a penalty. Teams may substitute any number of their players between downs; this "platoon" system replaced the original system, which featured limited substitution rules, and has resulted in teams utilizing specialized offensive, defensive and special teams units. The number of players allowed on an active roster varies by league;

6048-636: The Goldfish Club . British pilot Eric Brown noted in an interview that the Mae West device saved his life after he was forced into the ocean following the sinking of the aircraft carrier he was on, HMS Audacity , by a U-boat in WW2. Out of the 24 crew in his group in the water, the only two who survived were two pilots wearing Mae Wests, the rest were sailors wearing more basic flotation devices (inflatable rings) that kept them afloat, but did not keep their heads out of

6174-584: The NCAA and the NAIA . The National Football League (NFL) has the highest average attendance of any professional sports league in the world . Its championship game, the Super Bowl , ranks among the most-watched club sporting events globally. In 2022, the league had an annual revenue of around $ 18.6 billion, making it the most valuable sports league in the world. Other professional and amateur leagues exist worldwide, but

6300-610: The Seattle Seahawks on December 12. He finished the 2006 season with the team and was released the following year on July 27, 2007. Cooper was claimed off waivers by the Steelers on July 30, 2007. On September 19, he was released by the Steelers. On November 27, 2007, Cooper signed with the Jacksonville Jaguars . The Jaguars released him on December 7. The Steelers signed Cooper for a third time on December 9, 2007. He became

6426-466: The Tampa Bay Buccaneers in the third round (79th overall) of the 2004 NFL draft . He was released just before the start of the 2006 season, on September 2. Cooper signed with the Minnesota Vikings on September 5, 2006. He was released on October 30. On October 31, 2006, Cooper was claimed off waivers by the Pittsburgh Steelers . The Steelers waived him on December 5. Cooper was signed by

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6552-595: The UK , Captain John Ross Ward (later Vice Admiral of the Royal Navy ). He created a brown cork vest in 1854 to be worn by lifeboat crews for both weather protection and buoyancy . They would be worn over the blue/grey waterproof oilskins In 1900, French electrical engineer, Gustave Trouvé , patented a battery-powered wearable lifejacket. It incorporated small, rubber-insulated maritime electric batteries not only to inflate

6678-706: The University of Washington . On March 1, 2009, Cooper and three other men went missing after their boat capsized in rough seas near Clearwater, Florida . Cooper and two of the men are now presumed to be dead. Cooper was the oldest child of KPNX sportscaster Bruce Cooper and wife Donna. He has a younger sister named Donielle. He was born in Mesa, Arizona and was raised in Gilbert, Arizona , and attended Gilbert Junior High School and Highland High School , where he became an All-State player in football. Though his grandfather worked in

6804-412: The center (C), are allowed to line up in or cross the neutral zone until the ball is snapped. Interior offensive linemen are not allowed to move until the snap of the ball. The main backfield positions are the quarterback (QB), halfback/tailback (HB/TB), and fullback (FB). The quarterback is the leader of the offense. Either the quarterback or a coach calls the plays. Quarterbacks typically inform

6930-409: The commissioner . NCAA and NFHS teams are "strongly advised" to number their offensive players according to a league-suggested numbering scheme. Although the sport is played almost exclusively by men, women are eligible to play in high school, college, and professional football. No woman has ever played in the NFL, but women have played in high school and college football games. In 2018, 1,100 of

7056-545: The forward pass , created the neutral zone , and specified the size and shape of the football. The sport is closely related to Canadian football , which evolved in parallel with and at the same time as the American game, although its rules were developed independently from those of Camp. Most of the features that distinguish American football from rugby and soccer are also present in Canadian football. The two sports are considered

7182-411: The kickoff , which starts the first and third quarters and overtime and follows a try attempt or a successful field goal; the safety kick follows a safety. On a kickoff, the ball is placed at the 35-yard line of the kicking team in professional and college play and at the 40-yard line in high school play. The ball may be drop kicked or place kicked. If a place kick is chosen, the ball can be placed on

7308-407: The neutral zone was created along the width of the football before the snap. Scoring was also adjusted: points awarded for field goals were reduced to three in 1909 and points for touchdowns were raised to six in 1912. Also in 1912, the field was shortened to 100 yards (91 m) long, two 10-yard-long (9.1 m) end zones were created, and teams were given four downs instead of three to advance

7434-407: The punter (P), long snapper, upback , and gunner . The long snapper snaps the football directly to the punter, who then drops and kicks it before it hits the ground. Gunners line up split outside the line and race down the field, aiming to tackle the punt returner (PR)—the player who catches the punt. Upbacks line up a short distance behind the line of scrimmage, providing additional protection to

7560-413: The 1966 season. Once the merger was completed, it was no longer a championship game between two leagues and reverted to the NFL championship game, which came to be known as the Super Bowl . College football maintained a tradition of postseason bowl games . Each bowl game was associated with a particular conference and earning a spot in a bowl game was the reward for winning a conference. This arrangement

7686-552: The 225,000 players in Pop Warner Little Scholars youth football were girls, and around 11% of the 5.5 million Americans who report playing tackle football are female according to the Sports and Fitness Industry Association. The role of the offensive unit is to advance the football down the field with the ultimate goal of scoring a touchdown . The offensive team must line up in a legal formation before they can snap

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7812-768: The Halkey Roberts Pro firing system have all but eliminated accidental firing. Drifting in open seas and international waters, as encountered on long sea voyages and by military forces, requires prolonged survival in water. Suitable life jackets are often attached to a vest with pockets and attachment points for distress signaling and survival aids, for example, a handheld two-way radio ( walkie-talkie ), emergency beacon (406 MHz frequency), signal mirror, sea marker dye, smoke or light signal flares, strobe light, first-aid supplies, concentrated nutritional items, water purification supplies, shark repellent , knife, and pistol. Accessories such as leg straps can be utilized to keep

7938-508: The NFL had established itself as America's premier professional football league. The dominant form of football at the time was played at the collegiate level . The upstart NFL received a boost to its legitimacy in 1925, however, when an NFL team, the Pottsville Maroons , defeated a team of Notre Dame all-stars in an exhibition game . A greater emphasis on the passing game helped professional football to distinguish itself further from

8064-564: The NFL has a 53-man roster, while NCAA Division I allows teams to have 63 scholarship players in the FCS and 85 scholarship players in the FBS, respectively. Individual players in a football game must be designated with a uniform number between 1 and 99, though some teams may "retire" certain numbers , making them unavailable to players. NFL teams are required to number their players by a league-approved numbering system, and any exceptions must be approved by

8190-460: The advent of artificial rubber inside the leather outer shell to sustain crushing forces . At all levels of play, the football is inflated to 12 + 1 ⁄ 2 to 13 + 1 ⁄ 2  psi (86 to 93 kPa), or just under one atmosphere, and weighs 14 to 15 ounces (400 to 430 g); beyond that, the exact dimensions vary slightly. In professional play the ball has a long axis of 11 to 11 + 1 ⁄ 4 inches (28 to 29 cm),

8316-568: The athletic department of Arizona State University , Cooper attended the University of Washington . He graduated with a degree in sociology and was a member of the Pac-10 All-Conference team in 2003. Cooper and wife Rebekah, who met while attending the University of Washington, have a daughter named Delaney Christine. In the offseason, the family lived in Tampa, Florida . Cooper was selected by

8442-491: The attachment of rescue gear) are made for swiftwater rescue technicians . Personal flotation devices have been developed for dogs and other pets. While the USCG does not certify personal flotation devices for animals, many manufacturers produce life jackets for dogs and cats. Dogs and cats have been known to die from drowning, either because they do not know how to swim, or because they tire out from overexposure or old age, or have

8568-550: The ball 10 yards (9.1 m). The roughing the passer penalty was implemented in 1914, and eligible players were first allowed to catch the ball anywhere on the field in 1918. On November 12, 1892, Pudge Heffelfinger was paid $ 500 (equivalent to $ 16,956 in 2023) to play a game for the Allegheny Athletic Association against the Pittsburgh Athletic Club . This is the first recorded instance of

8694-435: The ball is caught, and the ball may not be advanced. Officials are responsible for enforcing game rules and monitoring the clock. All officials carry a whistle and wear black-and-white striped shirts and black hats except for the referee, whose hat is white. Each carries a weighted yellow flag that is thrown to the ground to signal that a foul has been called. An official who spots multiple fouls will throw their hat as

8820-430: The ball. An offensive formation is considered illegal if there are more than four players in the backfield or fewer than five players numbered 50–79 on the offensive line. Players can line up temporarily in a position whose eligibility is different from what their number permits as long as they report the change immediately to the referee, who then informs the defensive team of the change. Neither team's players, except

8946-462: The boat. Although most pet life jackets are passive devices, there is at least one automatically inflated life jacket available for pets (made by Critter's Inflatable, LLC). An automatic flotation device is generally more expensive than a foam life jacket, but, like automatic PFDs designed for humans, they are less bulky to wear when not inflated, and when inflated may provide more buoyancy than foam devices. Automatic pet flotation devices are popular in

9072-694: The buoyancy on the wearer's torso is such that a righting moment (rotational force) results that will eventually turn most persons who are floating face down in the water (for example, because they are unconscious) into a face up orientation with their bodies inclined backward, unlike more simply designed common foam buoyancy vests. A life jacket that is too loose may not provide sufficient buoyancy in case of an emergency. Today these air chamber vests are commonly referred to as 'inflatable life jackets or vests' and are available not only for commercial applications but also for those engaged in recreational boating, fishing, sailing, kayaking and canoeing. They are available in

9198-455: The capsizing, he and the other three men, all wearing flotation devices , struggled overnight to remain on top of the capsized hull of the boat, with water reaching chest-high over the partially submerged hull and waves of approximately 6 ft (1.83 m). Cooper and Smith became non-responsive and separated from the vessel between 5:30 and 6:30 the morning of March 1, and Bleakley became non-responsive and separated about 24 hours later, which

9324-573: The college game during the late 1930s. Football, in general, became increasingly popular following the 1958 NFL Championship game between the Baltimore Colts and the New York Giants , still referred to as the "Greatest Game Ever Played". The game, a 23–17 overtime victory by the Colts, was seen by millions of television viewers and had a major influence on the popularity of the sport. This, along with

9450-543: The conference, as they favored a rugby-style game that allowed running with the ball. After playing McGill University using both American (known as "the Boston game ") for the first game and Canadian (rugby) rules for the second one, the Harvard players preferred the Canadian style of having only 11 men on the field, running the ball without having to be chased by an opponent, the forward pass, tackling, and using an oblong instead of

9576-541: The conservative NFL to expand to Dallas and Minnesota in an attempt to destroy the new league. Meanwhile, the AFL introduced many new features to professional football in the United States: official time was kept on a scoreboard clock rather than on a watch in the referee's pocket, as the NFL did; optional two-point conversions by pass or run after touchdowns; names on the jerseys of players; and several others, including expansion of

9702-574: The craft capsize. To be on the safe side, a pill-activated inflation device is preferred. A small pill that dissolves on water contact is the safest option, as it also works in shallow waters where a hydrostatic activator fails. This type of jacket is called an 'automatic'. As it is more sensitive to the presence of water, early models could also be activated by very heavy rain or spray. For this reason, spare re-arming kits should be carried on board for each life jacket. However, with modern cup/bobbin mechanisms this problem rarely arises and mechanisms such as

9828-413: The crossbars of the defense's goalposts. In practice, almost all field goal attempts are done via place kick. While drop kicks were common in the early days of the sport, the shape of modern footballs makes it difficult to reliably drop kick the ball. The last successful scoring play by drop kick in the NFL was accomplished in 2006; prior to that, the last successful drop kick had been made in 1941. After

9954-399: The defense is to prevent the offense from scoring by tackling the ball carrier or by forcing turnovers . Turnovers include interceptions (a defender catching a forward pass intended for the offense) and forced fumbles (taking possession of the ball from the ball-carrier). The defensive line (DL) consists of defensive ends (DE) and defensive tackles (DT). Defensive ends line up on

10080-430: The defensive backfield. They are divided into two types: middle linebackers (MLB) and outside linebackers (OLB). Linebackers tend to serve as the defensive leaders and call the defensive plays, given their vantage point of the offensive backfield. Their roles include defending the run, pressuring the quarterback, and tackling backs, wide receivers, and tight ends in the passing game. The defensive backfield , often called

10206-542: The design of life jackets was also conducted in the UK by Edgar Pask , the first Professor of Anaesthesia at Newcastle University . His research involved self-administered anaesthesia as a means of simulating unconsciousness in freezing sea-water. Pask's work earned him the OBE and the description of "the bravest man in the RAF never to have flown an aeroplane". The M1926 Life Preserver belt

10332-472: The ends and sides of the field are known as the end lines and sidelines . Goal lines are marked 10 yards (9.1 m) inward from each end line. Weighted pylons are placed the sidelines on the inside corner of the intersections with the goal lines and end lines. White markings on the field identify the distance from the end zone. Inbound lines, or hash marks , are short parallel lines that mark off 1-yard (0.91 m) increments. Yard lines , which can run

10458-404: The ends of the line, while defensive tackles line up inside, between the defensive ends. The primary responsibilities of defensive ends and defensive tackles are to stop running plays on the outside and inside, respectively, to pressure the quarterback on passing plays, and to occupy the line so that the linebackers can break through. Linebackers line up behind the defensive line but in front of

10584-492: The exception of some life jackets which are inflated with air. Other highly specialized forms of PFDs include buoyancy compensators used for scuba diving , and submarine escape devices. The oldest examples of primitive life jackets can be traced back to inflated bladders, animal skins, or hollow sealed gourds for support when crossing deep streams and rivers. Purpose-designed buoyant safety devices consisting of simple blocks of wood or cork were used by Norwegian seamen. In

10710-499: The feet, hands, head, or sides, with the objective being to advance it into the opponent's goal. Rutgers won the game 6–4. Collegiate play continued for several years with games played using the rules of the host school. Representatives of Yale, Columbia , Princeton and Rutgers met on October 19, 1873, to create a standard set of rules for use by all schools. Teams were set at 20 players each, and fields of 400 by 250 feet (122 m × 76 m) were specified. Harvard abstained from

10836-416: The football to the defense, but if they succeed, they are given a new set of four downs to continue the drive . Points are scored primarily by advancing the ball into the opposing team's end zone for a touchdown or kicking the ball through the opponent's goalposts for a field goal . The team with the most points at the end of the game wins. American football evolved in the United States, originating from

10962-463: The form of a simple vest , a jacket , a full-body suit (one piece coverall), or their variations suited for particular purposes. They are most commonly made of a tough synthetic fiber material encapsulating a source of buoyancy, such as foam or a chamber of air, and are often brightly colored yellow or orange to maximize visibility for rescuers. Some devices consist of a combination of both buoyancy foam and an air chamber. Retroreflective "SOLAS" tape

11088-419: The game clock based on the direction of the appropriate official . A separate play clock is used to show the amount of time within which the offense must initiate a play. The play clock is set to 25 seconds after certain administrative stoppages in play and to 40 seconds when play is proceeding without such stoppages. If the offense fails to start a play before the play clock reads "00", a delay of game foul

11214-618: The game unless major changes were made. In response, 62 colleges and universities met in New York City to discuss rule changes on December 28, 1905. These proceedings resulted in the formation of the Intercollegiate Athletic Association of the United States, later renamed the National Collegiate Athletic Association (NCAA). The legal forward pass was introduced in 1906, although its effect

11340-443: The ground or a tee; a holder may be used in either case. On a safety kick, the kicking team kicks the ball from their own 20-yard line. They can punt, drop kick or place kick the ball, but a tee may not be used in professional play. Any member of the receiving team may catch or advance the ball. The ball may be recovered by the kicking team once it has gone at least ten yards and has touched the ground or has been touched by any member of

11466-434: The guards. The principal receivers are the wide receivers (WR) and the tight ends (TE). Wide receivers line up on or near the line of scrimmage, split outside the line. The main goal of the wide receiver is to catch passes thrown by the quarterback, but they may also function as decoys or as blockers during running plays. Tight ends line up outside the tackles and function both as receivers and as blockers. The role of

11592-539: The idea to them. Personal flotation devices were not part of the equipment issued to naval sailors until the early 19th century, for example at the Napoleonic Battle of Trafalgar , although seamen who were press-ganged into naval service might have used such devices to jump ship and swim to freedom. Following the 1852 sinking of the troopship Birkenhead , Ensign G.A. Lucas of the 73rd Regiment of Foot wrote "Cornet Bond, 12th Lancers, was...the only person to have

11718-539: The illegal payment of college players who were still in school. The National Football League (NFL), a group of professional teams that was originally established in 1920 as the American Professional Football Association, aimed to solve these problems. This new league's stated goals included an end to bidding wars over players, prevention of the use of college players, and abolition of the practice of paying players to leave another team. By 1922,

11844-430: The inflated chambers in position for floating in a stable attitude, and splash or face shields constructed of clear see-through vinyl covers the head and face to prevent water from waves from inundating the face and entering the airway through the nose or mouth. Some formats of PFDs are designed for long term immersion in cold water in that they provide insulation as well as buoyancy. While a wetsuit of neoprene rubber or

11970-460: The inflated life preserver often appeared to be as large-breasted as the actress Mae West . It was popular during the Second World War with U.S. Army Air Forces and Royal Air Force servicemen, who were issued inflatable Mae Wests as part of their flight gear. Air crew members whose lives were saved by use of the Mae West (and other personal flotation devices) were eligible for membership in

12096-448: The innovations introduced by the new American Football League (AFL) in the early 1960s, helped football to become the most popular sport in the United States by the mid-1960s. The rival AFL arose in 1960 and challenged the NFL's dominance. The AFL began in relative obscurity but eventually thrived, with an initial television contract with the ABC television network. The AFL's existence forced

12222-683: The jacket, but also to power a light to transmit and receive SOS messages and to launch a distress flare. In 1904 the rigid cork material was supplanted by pouches containing watertight cells filled with kapok , a vegetable material. These soft cells were much more flexible and comfortable to wear compared with devices using hard cork pieces. Kapok buoyancy was used in many navies fighting in World War II . In 1972 yellow or red Beaufort synthetic foam life jackets supplanted kapok for 'inherently buoyant' (vs. inflated and therefore not inherently buoyant) flotation. These modern jackets could support not only

12348-485: The missing boat shortly after midnight on March 1, 2009. By 1:35 p.m. local time on March 2, 2009, the boat had been located, overturned, with Schuyler clinging to it. The search for the three missing men was called off by the Coast Guard, but friends and relatives organized their own search. The private search was called off on March 6. Cooper, Smith, and Bleakley are presumed dead. On March 11, Cooper's wife filed for

12474-429: The offense advances ten or more yards in the four downs, they are awarded a new set of four downs. If they fail to advance ten yards, possession of the football is turned over to the defense. In most situations, if the offense reaches their fourth down they will punt the ball to the other team, which forces them to begin their drive from farther down the field; if they are in field goal range , they might attempt to score

12600-445: The plane of the two end lines. The crossbar of these posts is 10 feet (3.0 m) above the ground, with vertical uprights at the end of the crossbar 18 feet 6 inches (5.64 m) apart for professional and collegiate play, and 23 feet 4 inches (7.11 m) apart for high school play. The uprights extend vertically 35 feet (11 m) on professional fields, a minimum of 10 yards (9.1 m) on college fields, and

12726-448: The point(s)-after-touchdown (PAT) or conversion, which is a single scoring opportunity. This is generally attempted from the two- or three-yard line, depending on the level of play. If the PAT is scored by a place kick or drop kick through the goal posts, it is worth one point, typically called the extra point. If the PAT is scored by what would normally be a touchdown, it is worth two points; this

12852-541: The primary proponents of the rugby-style game, compromised and did not request the name of the sport be changed to "rugby". The terms " gridiron " or "American football" are favored in English-speaking countries where other types of football are popular, such as the United Kingdom, Ireland, New Zealand, and Australia. American football evolved from the sports of rugby and soccer . Rugby, like American football,

12978-429: The primary variants of gridiron football . American football is the most popular sport in the United States in terms of broadcast viewership audience. The most popular forms of the game are professional and college football , with the other major levels being high-school and youth football. As of 2022 , nearly 1.04 million high-school athletes play the sport in the U.S., with another 81,000 college athletes in

13104-422: The punter. In football, the winner is the team that has scored more points at the end of the game. There are multiple ways to score in a football game. The touchdown (TD), worth six points, is the most valuable scoring play in American football. A touchdown is scored when a live ball is advanced into, caught, or recovered in the opposing team's end zone. The scoring team then attempts a try, more commonly known as

13230-401: The receiving team. The three types of scrimmage kicks are place kicks, drop kicks, and punts. Only place kicks and drop kicks can score points. The place kick is the standard method used to score points, because the pointy shape of the football makes it difficult to reliably drop kick. Once the ball has been kicked from a scrimmage kick, it can be advanced by the kicking team only if it

13356-474: The rescuer but the rescued at the same time. The University of Victoria pioneered research and development of the UVic Thermo Float PFD, which provides superior protection from immersion hypothermia by incorporating a neoprene rubber "diaper" that seals the user's upper thigh and groin region from contact with otherwise cold, flushing and debilitating water. During World War II, research to improve

13482-631: The rest of the offense of the play in the huddle before the team lines up. The quarterback lines up behind the center to take the snap and then hands the ball off, throws it, or runs with it. The primary role of the halfback, also known as the running back or tailback, is to carry the ball on running plays. Halfbacks may also serve as receivers. Fullbacks tend to be larger than halfbacks and function primarily as blockers, but they are sometimes used as runners in short-yardage or goal-line situations. They are seldom used as receivers. The offensive line (OL) consists of several players whose primary function

13608-499: The role of minority players, actively recruited by the league in contrast to the NFL. The AFL also signed several star college players who had also been drafted by NFL teams. Competition for players heated up in 1965, when the AFL New York Jets signed rookie Joe Namath to a then-record $ 437,000 contract (equivalent to $ 4.23 million in 2023). A five-year, $ 40 million NBC television contract followed, which helped to sustain

13734-503: The secondary, consists of cornerbacks (CB) and safeties (S). Safeties are themselves divided into free safeties (FS) and strong safeties (SS). Cornerbacks line up outside the defensive formation, typically opposite a receiver to be able to cover them. Safeties line up between the cornerbacks but farther back in the secondary. Safeties tend to be viewed as "the last line of defense" and are responsible for stopping deep passing plays as well as breakout running plays. The special teams unit

13860-539: The sport does not have the international popularity of other American sports like baseball or basketball ; the sport maintains a growing following in the rest of North America, Europe, Brazil, and Japan. In the United States, American football is referred to as "football". The term "football" was officially established in the rulebook for the 1876 college football season , when the sport first shifted from soccer-style rules to rugby-style rules. Although it could easily have been called "rugby" at this point, Harvard, one of

13986-439: The sports of soccer and rugby . The first American football game was played on November 6, 1869 , between two college teams, Rutgers and Princeton , using rules based on the rules of soccer at the time. A set of rule changes drawn up from 1880 onward by Walter Camp , the "Father of American Football", established the snap , the line of scrimmage , eleven-player teams, and the concept of downs. Later rule changes legalized

14112-438: The thin air cell fabric is sliced open by sharp metal fragments during emergency evacuation and egress. Most life jackets for leisure use are of the single air chamber type. Aircraft devices for crew and passengers are always inflatable since it may be necessary to swim down and away from a ditched or submerged aircraft and inflated or foam filled devices would significantly impede a person from swimming downward in order to escape

14238-462: The time, was that it did not keep the wearer's head back out of the water while they were floating. This meant if they went unconscious they would roll forward and end up face down in the water and drown. The Mae West was a common nickname for the first inflatable life preserver, which was invented in 1928 by Peter Markus (1885–1974) ( US Patent 1694714), with his subsequent improvements in 1930 and 1931. The nickname originated because someone wearing

14364-417: The vest from riding up when worn in the water and restrict the wearer from slipping out of the life vest. These straps are adjustable and are included on many different life vests designed to be worn by everyone from infants to adults. The headrest flap is designed to help support the head and keep it out of the water. A grab handle is attached to the headrest to be used if needed to rescue or lift someone out of

14490-455: The water face-down. In these cases the buoyancy of the clothing holds a person on the water surface, which prevents the hydrostatic release. As a result, a person can drown although wearing a fully functional life jacket. In addition there are some circumstances in which the use of self-triggering devices can result in the wearer becoming trapped underwater. For example, the coxswain of a bowloader rowing shell risks being unable to escape should

14616-522: The water. Devices designed and approved by authorities for use by civilians (recreational boaters, sailors, canoeists , kayakers ) differ from those designed for use by passengers and crew of aircraft (helicopters, airplanes) and of commercial vessels ( tugboats , passenger ferries, cargo ships). Devices used by government and military (e.g. water police , coast guard , navy , marines ) generally have features not found on civilian or commercial models, for example compatibility with other items worn, like

14742-449: The water. Buoyancy aids are rated by the amount of buoyancy they provide in Newtons - the minimum rating to be considered suitable as an adult life-jacket for offshore use is 150 newtons (34  lbf ). Life jackets for outfitting large commercial transport ventures in potentially dangerous waters, such as coastal cruises, offshore passages, and overwater air flights, consisting of either

14868-557: The wearer should they end up in the water. PFDs are also kept on large vessels for passengers to wear in an emergency in order to help them stay afloat should they be forced to enter the water or accidentally fall overboard during an evacuation. PFDs are commonly worn for swimming and/or other activities that require an individual to be in water. This is for reasons such as safety (to prevent the drowning of weak swimmers, swimmers in dangerous conditions or swimmers far from safety), to make swimming easier and less demanding, to allow someone who

14994-411: The width of the field, are marked every 5 yards (4.6 m). A one-yard-wide line is placed at each end of the field; this line is marked at the center of the two-yard line in professional play and at the three-yard line in college play. Numerals that display the distance from the closest goal line in yards are placed on both sides of the field every ten yards. Goalposts are located at the center of

15120-408: The winning team decides to defer, the losing team chooses the option the winning team did not select—to receive, kick, or select a goal to defend to begin the second half. Most teams choose to receive or defer, because choosing to kick the ball to start the game allows the other team to choose which goal to defend. Teams switch goals following the first and third quarters. If a down is in progress when

15246-408: The young league. The bidding war for players ended in 1966 when NFL owners approached the AFL regarding a merger, and the two leagues agreed on one that took full effect in 1970. This agreement provided for a common draft that would take place each year, and it instituted an annual World Championship game to be played between the champions of each league. This championship game began play at the end of

15372-418: Was initially minimal due to the restrictions placed on its use. The idea of a 40-yard-wider field was opposed by Harvard due to the size of the new Harvard Stadium . Other rule changes introduced that year included the reduction of playing time from 70 to 60 minutes and an increase of the distance required for a first down from 5 to 10 yards (4.6 to 9.1 m). To reduce infighting and dirty play between teams,

15498-511: Was issued to US infantry where they were on ships or near the water, in particular amphibious landings such as D-Day. The belt had two CO 2 bottles that could be activated to inflate the belt if needed, or it could be blown up manually with a tube, if the CO 2 bottles failed. The Admiralty Pattern 14124 inflatable life ring was the main life preserver issued to British sailors at the start of WW2. It provided about 8.5 lbs of buoyancy. Its inherent flaw, and an issue with many life preservers at

15624-499: Was less than six hours before Schuyler was rescued. The investigator described the symptoms Schuyler witnessed as characteristic of hypothermia . Cooper will be portrayed by Quentin Plair in the upcoming film Not Without Hope . American football American football , referred to simply as football in the United States and Canada and also known as gridiron football , is a team sport played by two teams of eleven players on

15750-440: Was necessary to prevent this strategy from taking hold, and a reversion to the scrum was considered. However, Camp successfully proposed a rule in 1882 that limited each team to three downs , or tackles, to advance the ball 5 yards (4.6 m). Failure to advance the ball the required distance within those three downs would result in control of the ball being forfeited to the other team. This change effectively made American football

15876-542: Was profitable, but it tended to prevent the two top-ranked teams from meeting in a true national championship game, as they would normally be committed to the bowl games of their respective conferences. Several systems have been used since 1992 to determine a national champion of college football. The first was the Bowl Coalition , in place from 1992 to 1994. This was replaced in 1995 by the Bowl Alliance , which gave way to

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