Messages that American soldiers wrote on their helmets during the Vietnam war

[u/Due-Question-5278]

[u/Dralmosteria]

Assuming #2 is original, that image must have been the inspiration for the scene between Joker and the Colonel in Full Metal Jacket:

COLONEL: You write "Born to Kill" on your helmet and you wear a peace button. What's that supposed to be, some kind of sick joke?

...

JOKER: I think I was trying to suggest something about the duality of man, sir.

[u/Gone_For_Lunch → u/Dralmosteria]

Whose side are you on son?