When Hell Broke Loose (1958)

Near the end of the war in Germany GI Steve Boland a selfdescribed sharpoperator meets a German girl Ilsa and they fall in love Ilsas brother Karl whom she has not seen in three years and his fellow Nazi Ludwig visit Ilsa Karl proudly informs her that he and Ludwig are Werewolves a group of Nazi assassins parachuted behind Allied lines for the purpose of killing Allied High Command officers She and Steve go to Army Intelligence with their information where Steve is immediately arrested for being AWOL Captain Melton of Army G2 intervenes on Steves behalf as G2 has had a suspicion about the existence of the Werewolves but no concrete info before now