<<Really? Full Metal Jacket glorified war?>>
Honestly I don't remember enough of it to discuss in detail From what I recall, there were no babes in it but otherwise, yeah, I think it glamorized war in some ways. Ir showed Americans, who for the most part are wage slaves or debt slaves, leading shit lives in jobs that they can be fired from virtually at will, an alternative self-image where instead of being ciphers or schleppers, they can walk around with weapons in their hands and terrorize others, with the power over life and death that normally only the gods can possess. It showed them facing physical danger with courage and resignation. Nobody shits in their pants, nobody's wounds ever show messy body parts hanging out of their cavities . . . at least, not in the little that I recall of the film.
Of course there are films that glorify war much more than Full Metal Jacket. But it's inevitable in the telling of any war story that the narrator comes out as heroic, simply because (in mythic terms) he was there - - he went into the lair of the beast and he returned to his life in the world.
J.D. Salinger landed in Normandy on D-Day and fought his way across Europe with a unit that saw more casualties than any other US unit in the European Theatre of Operations, through some of the bloodiest battles of the war, and holds three Presidential unit citations, but never wrote one word that directly described his or his unit's combat experiences, true or fictionalized. (For Esme With Love and Squalor is the closest he ever came, but it describes only the life of the troops in England and the mental traumatization or "battle fatigue" of a soldier after he's come out of combat.) In one of his short stories whose title I have forgotten, he describes the thoughts of a young man invited to dinner by an older man and listening to the old guy's war stories; the young man thinks at one point "If I ever have to go to war, and survive, I'll never tell anyone about it because simply telling the story of the battle glorifies it." That one short story provides the only clue as to the reason for Salinger's silence.
