FMJ, sure. He also flew a helicopter in Apocalypse Now, and played the father figure of Dr. Gregory House.
It was Full Metal Jacket that gave him his best role, and best line:
“I’ll bet you’re the kinda guy that would fuck a person in the ass, and not even have the Goddamn common courtesy to give him a reach-around. I’ll be watching you!”
Gunnery Sergeant Hartman: Well, any fucking time, sweetheart! Private Gomer Pyle: Sir, I’m trying, sir. Gunnery Sergeant Hartman: Private Pyle I’m gonna give you three seconds; exactly three-fucking-seconds to wipe that stupid looking grin off your face or I will gouge out your eyeballs and skull-fuck you! ONE!