BYU has Athletics teams in a number of different sports ranging from Men's volleyball to Women's rugby. They play mainly in the Mountain West Conference since its inception in 1999. Prior to that time BYU teams competed in the Western Athletic Conference. All teams are named the "Cougars", and Cosmo the Cougar has been the school's mascot since 1953. The school's fight song is the Cougar Fight Song. Because many of its players serve on full time missions for two years, BYU's athletes are often older on average than other school's players. The NCAA allows students to serve missions for two years without subtracting that time from their eligibility period. This has caused minor controversy, but is largely recognized as not lending the school any significant advantage, since players receive no athletic and little physical training during their missions.[117] BYU has also received attention from sports networks for refusal to play games on Sunday, as well as expelling players due to honor code violations.