 Many generals doubted the benefits, but the Military Police Corps, tasked with patrolling the "safe" rear area behind the battle line insisted that the Army fund a slow but steady production of the bullet resistant M1114 Humvee.In 1999, the United States Army began buying a limited number of M1117s (originally the ASV-150) for the Military Police Corps.This purpose-built ASV was derived from Cadillac Gage's previous Commando family of AFV which was used in Vietnam for base security.