sentences:  Many teams coached by members of the Parcells-Belichick coaching tree currently run similar defensive systems, such as the University of Alabama under Nick Saban and the Cleveland Browns under Eric Mangini from 2009–2010.The "Phillips 3–4", a one-gap version of the 3–4, was also brought into the league by Bum Phillips, head coach of the Houston Oilers in the 1970s.The Phillips 3–4 defense is currently run by the San Diego Chargers as well as the Dallas Cowboys formerly coached by Wade Phillips, the son of Bum Phillips.