Nun And The Sergeant, The (1962) - I Don't Like Psychos

Prefiguring The Dirty Dozen, McGrath (Robert Webber) doesn't tell the (un-credited) brig officer he's collecting inmates (first Kenny Miller, notably Leo Gordon, Valentin de Vargas) for a suicide mission in Korea, in The Nun And The Sergeant, 1962, original screenplay by Don Cerveris.