The school's sports teams are called the Sooners, a nickname given to early settlers during the land run who sneaked into the offered territory and staked claims illegally before they were officially allowed to. They participate in the NCAA's Division I-Bowl Subdivision and in the Big 12 Conference. The school sponsors nine sports for both men and women. The university has claimed 36 team national championships, which includes 7 football national championships (football championships are not awarded by the NCAA). By far, OU's most famous and storied athletic program is the football program, which has produced seven Heisman Trophy winners: Billy Vessels in 1952, Steve Owens in 1969, Billy Sims in 1978, Jason White in 2003, Sam Bradford in 2008, Baker Mayfield in 2017, and Kyler Murray in 2018. Many Pro Football Hall of Famers, including Lee Roy Selmon and Troy Aikman, also attended the University of Oklahoma. In 1988, OU became the first school to participate in both the football and basketball national championships in the same year, an achievement unequaled until the 2006 season, when Ohio State and the University of Florida were both in each, with Florida winning both games. Oklahoma also currently holds the record for the longest winning streak in NCAA Division I history when they won 47 consecutive games between 1953 and 1957. In reference to the team's success and popularity as a symbol of state pride, George Lynn Cross, OU's president from 1943 to 1968, once told the Oklahoma State Senate, "I want a university the football team can be proud of."