The 3-4 defense was originally developed by Bud Wilkinson at the University of Oklahoma in the 1940s. Chuck Fairbanks learned the defense from Wilkinson and is credited with importing it to the NFL. Fairbanks' schemes have influenced many important winning coaches in the years following his retirement, among them Bill Parcells, Bill Cowher, and Bill Belichick. The 3-4 defense is a defensive alignment that consists of three down linemen, four li...

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