Bill Belichick was initially exposed to the 3–4 defense while working as an assistant under Red Miller, head coach of the Denver Broncos and a former Patriots offensive coordinator under Fairbanks. Joe Collier was the defensive coordinator under Red Miller at the time, and his Orange Crush Defense was very successful at stifling opposing offenses. The Broncos had decided to adopt the 3–4 in 1977. Bill Belichick subsequently refined his understanding of the 3–4 as a linebackers coach and defensive coordinator under Parcells with the Giants. Belichick returned the 3–4 defense back to New England when he became coach of the team in 2000. Romeo Crennel subsequently became defensive coordinator for the team.