Thou Shalt Not Kill Except (1985)

Vietnam 1969 War is Hell For Marine Sergeant Jack Stryker however Hell is just the beginning Trapped outside a Viet Cong village Stryker takes two bullets to the leg Sent home from the war he discovers his exgirlfriend has been kidnapped by a religious cult with a vicious Mansonlike leader Stryker teams up with some marine friends to form an assassination squad and annihilate the gang of crazed killers