In VN I enjoyed reading flak jacket "grafitti".

Some of my favorites:

"A sucking chest wound is just God's way of letting you know you're in a firefight".

"Yea though I walk through the valley of death, I will fear no evil, for I am the meanest mother f####r in the valley".

Or the shorter version of above "MMFIV".

The signature, in cursive - "John Wayne 1939".