“- Ty: I want to join the army you're gathering. I'm not one of these farmers, I'm just travelling with them until I found you.
- Job: Then help me gather up these pumpkin-heads without killing them.”
Vincent Klyn - Ty
Lance Henriksen - Job

“We Marines have no qualms about killing Martians!”
James Karen - Gen. Climet Wilson

“- Scott Dantley: If the army had the guns, we just might be able to stop the killing.
- Pete Helmes: It's a bitch of a problem, isn't it, Jack?
- Jack Issel: Actually, I've been reading that it's the army that's doing most of the killing.”

Michael O'Donoghue - Scott Dantley
Eddie Albert - Pete Helmes
Judge Reinhold - Jack Issel

“Your rifle is only a tool. It is a hard heart that kills. If your killer instincts are not clean and strong you will hesitate at the moment of truth. You will not kill. You will become dead marines and then you will be in a world of shit because marines are not allowed to die without permission.”
R. Lee Ermey - Gny. Sgt. Hartman

“- Jimbo Kearn: Oh boy, military action, Ned, we're gonna kill us some goddam' Australians!
- Ned Gerblanski: I think we're fighting Canadians.
- Jimbo Kearn: Canadians, Australians, what's the difference?”
Matt Stone - Jimbo Kearn
Trey Parker - Ned Gerblanski