sentences:  It is unclear if the Patriots under Fairbanks or the Houston Oilers under Bum Phillips were the first team to bring the 3–4 defense to the NFL.Patriots defensive coordinator Hank Bullough made significant further innovations to the system.Parcells was linebackers coach under Ron Erhardt as head coach of the Patriots in 1980 (after Fairbanks left for Colorado in 1978 and Bullough lost out on the head coaching position).