In 1967, then-champion Ali was stripped of his title and suspended from boxing for 3½ years for his refusal to comply with the draft and enter the U.S. Army. In 1970, he first regained a boxing license and promptly fought comeback fights against Jerry Quarry and Oscar Bonavena in an attempt to regain the heavyweight championship from the then-undefeated Joe Frazier. In a bout dubbed the Fight of the Century, Frazier won a unanimous decision, leaving Ali fighting other contenders for years in an attempt at a new title shot.