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 ex-girlfriend has been kidnapped by a religious cult with a vicious Manson-like leader. Stryker teams up with some marine friends to form an assassination squad and annihilate the gang of crazed killers.

Unfortunately the movie Thou Shalt Not Kill... Except is not yet available on HBO Max.