The National Collegiate Athletic Association (NCAA) Division I Football Bowl Subdivision (FBS) includes 138 teams. Each team has one head coach. In addition to the head coach, most teams also have at least one offensive coordinator and defensive coordinator; however, the head coach will sometimes assume one of these roles as well. FBS is composed of ten conferences: American Conference (American), Atlantic Coast Conference (ACC), Big 12 Conference, Big Ten Conference, Conference USA (CUSA), Mid-American Conference (MAC), Mountain West Conference (MW), Pac-12 Conference (Pac-12), Southeastern Conference (SEC), and Sun Belt Conference (SBC). All FBS schools except two are members of one of these conferences.