Football — American

: Led by the quarterback , who calls plays and directs the unit. It includes the offensive line (blockers), running backs , wide receivers , and tight ends .

: Deployed for kicking situations, such as kickoffs , punts , and field goal attempts. Major Leagues and Structures american football

: The team without the ball tries to stop the offense's advance by tackling the ball carrier, intercepting passes, or forcing fumbles to gain possession. Player Units and Positions : Led by the quarterback , who calls