[Eight Ace]

There's a scene in an old war movie where a soldier forces a woman to give him head, and
she bites off his "dude"...he rifle butts her skull, she's dead, he falls down bleeding, they don't
show the sex but you get the gist....then the officer in charge (Lee Marvin maybe...??) comes into
this barn or whatever, sees whats happened, abuses the guy for letting the team down
....then mercy shoots the guy. Anyone know which movie this is?*



(*big reward for any information leading to the identification of this particular film!!)