sentences:  Belichick believes that teaching the techniques and fundamentals of his defense is more important than what alignment his defenses use, noting that he used a 4–3 defense when he coached the Cleveland Browns.Belichick served as head coach of the Browns from 1991–1995, and was only able to compile a 36–44 regular season record, along with a 1–1 mark in the 1994 NFL playoffs.Belichick's tenure as head coach of the Patriots has been far more successful.