The double-wing is an offensive formation which should not be confused with the Double Wing offense. The double-wing formation is used in many offenses from the youth level through college. The formation was first introduced by Glenn "Pop" Warner around 1912. Just a few offenses that use the formation are the double wing, flexbone and wing T offenses. It was the primary formation used by Ara Parseghian when he ran the wing T at Notre Dame University, winning National Championships in 1966 and 1973.