Question: What sport do both Billy Truax and Lance Rentzel have in common?

Context paragraphs:
Quintain (jousting): The quintain (from Latin "fifth"), also known as pavo (Latin "peacock"), may have included a number of lance games, often used as training for jousting, where the competitor would attempt to strike an object with his lance, sword or other weapon.  The common object was a shield or board on a pole (usually referred to, confusingly, as 'the quintain'), although a mannequin was sometimes used.  It was not unknown for a seated armoured knight to act as the target.

Water jousting: Water jousting is a sport practised principally in France and also Switzerland and Germany.  It is a form of jousting where the adversaries, carrying a lance and protected only by a shield, stand on a platform on the stern of a boat.  The boat is propelled by oarsmen or, in some cases, a motor may be used.  The aim of the sport is to send the adversary into the water whilst maintaining one's own balance on the platform.

Lance Rentzel: Thomas Lance Rentzel (born October 14, 1943) is a former American football flanker in the National Football League (NFL) for the Minnesota Vikings, Dallas Cowboys and the Los Angeles Rams.  He played college football at the University of Oklahoma.

Billy Truax: William Frederick Truax (born July 15, 1943) is a former professional American football tight end in the National Football League (NFL) from 1964 to 1973 for the Los Angeles Rams and the Dallas Cowboys.  He played in high school at Holy Cross in New Orleans and college football at Louisiana State University and was drafted in the second round of the 1964 NFL draft.  Following the 1970 NFL season, Truax was traded by the Rams to the Cowboys for wide receiver Lance Rentzel.  He was part of the Cowboys' Super Bowl VI championship team in 1971.

Wendell Tucker: Wendell Edward Tucker (born September 4, 1943) is a former professional American football player who played wide receiver for four seasons for the Los Angeles Rams.  Tucker spent most of his first season on the "taxi-squad" while learning behind the Rams' starting flanker Bernie Casey.  Tucker saw action in 10 of the team's 14 games in 1968 (catching only 7 passes but 4 of them went for touchdowns), and then became the starting flanker after Casey's retirement.  The 1969 season would prove to be his most productive as, playing opposite wide receiver Jack Snow, he caught 38 passes for 629 yards and 7 touchdowns, including a 93 yarder vs. the 49ers for the Coastal Division champion Rams.  Tucker returned in 1970 but was hampered by injuries and caught only 12 passes in 12 games.  In May 1971, Tucker was traded along with Billy Truax to the Dallas Cowboys for receiver Lance Rentzel.  However, unable to regain his trademark speed because of a knee injury, Tucker retired before the start of the 1971 season.

Canadian Cutting Horse Association: The Canadian Cutting Horse Association (CCHA) is a non-profit organization dedicated to promoting the equestrian sport of cutting in Canada.  Founded in 1954, it regulates a sport that began in the mid-1880s and became popular in Canada in the 1940s and 1950s.  The CCHA maintains a Hall of Fame to honour members who have made outstanding contributions to the sport.  The CCHA's patron is HRH Prince Philip, Duke of Edinburgh.  Cutting is a sport based on ranchwork that began in the early 19th century, cutting cattle out of herds.  Horses and riders are judged on how well they work to remove a single steer from a herd and keep it from returning.  The CCHA promotes a type of horse called the Canadian cutting horse; this type is made up of many breeds with a common stock horse background.

UUM-125 Sea Lance: The UUM-125 Sea Lance, initially known as the "Common ASW Standoff Weapon", was authorized in 1980 as a successor to both the UUM-44 SUBROC and RUR-5 ASROC anti-submarine missiles.  The Sea Lance was to be available in two versions, known as UUM-125A and RUM-125A.  The former would be a submarine-launched version, the latter surface-launched.

Names of Australian rules football: The sport of Australian football has been called by a number of different names throughout its history; but since 1905, after the formation of the Australasian Football Council, the game has been officially called "Australian football"; and the name has been codified by the sport's governing body, the AFL Commission, as the game's official name, in the "Laws of Australian football".  Historically, the sport has been called "Victorian rules" (referring to its origins in Melbourne), the "Victorian game", the "bouncing game", "Australasian rules", the "Australian game" and "national football", as well as several other names.  Today, the common names for the sport are "Australian rules football" or "football", and common nicknames for the sport are "footy", "Aussie rules" or sometimes "AFL" (a genericised abbreviation of Australian Football League, the sport's largest competition and only fully professional league).

Jim Trifunov: James Trifunov (Jarkovac, Austria-Hungary (now Serbia), July 18, 1903 – Winnipeg, Manitoba, June 27, 1993) was a Canadian freestyle sport wrestler who competed in the 1924 Summer Olympics, in the 1928 Summer Olympics, and in the 1932 Summer Olympics.  His parents came from Jarkovac, Serbia, and settled in Truax, Saskatchewan, in 1910.

William Windsor (goat): William "Billy" Windsor I is a cashmere goat who served as a lance corporal in the 1st Battalion, the Royal Welsh, an infantry battalion of the British Army.  He served as a lance corporal from 2001 until 2009, except for a three-month period in 2006 when he was demoted to fusilier, after inappropriate behaviour during the Queen's Official Birthday celebrations while deployed on active duty with the battalion on Cyprus.  He retired to Whipsnade Zoo in May 2009.

Supporting paragraphs: Billy Truax Lance Rentzel
Answer: football