» This article relates to sports. For the Vietnam War bombing raids, see Operation Linebacker and Operation Linebacker II. For the air defense version of the US infantry fighting vehicle, see M2 Bradley. A Linebacker (LB)'s a position in American and Canadian football that was invented by football coach Fielding Yost of the University of Michigan. Linebackers are members of the defensive team, and line up approximately three to five yards (4 m) behind the line of scrimmage, behind the defensive… (More on Linebacker)