Comparison of American football and rugby union possession of the ball at their own 20-yard (25 yard line in College Football) line. An important difference between the two sports involves the aftermath of a score. In American football, the scoring team kicks off, except after a safety. In rugby union, the team conceding the score kicks off (in rugby sevens, a variant of rugby union featuring seven players per side, the scoring team kicks off). An American football team consists of an offensive unit, a defensive unit and a "special teams" unit (involved in kicking and kick returns). Only eleven players can be on the field at
American football at the Summer Olympics professional American football players in both the NFL and CFL are not eligible. It has also been argued that due to roster restrictions, seven-on-seven is the most likely style of play to make it as a medal event in the same vein as Rugby in the 2016 Summer Olympics. American football at the Summer Olympics American football was featured in the Summer Olympic Games demonstration programme in 1904 and 1932. College football was played at the 1904 Olympics, which was played at Francis Field, but was, in reality, college teams playing each other as part of their regular seasons. The