I actually saw a guy do that very thing. Never found out what the hell he was thinking, guess he just didn't want to be there anymore.
Took a couple weeks to process, and during that time he was writing letters to his WIFE.
I venture to say they probably aren't married anymore, and he's probably had a difficult time in life because of that stupid decision.
Saw the same thing in the 1/27 during Tet, I was in another Unit. Put on a nightgown and offered to do unspeakable acts. Got the piss beat out of him and a Bad Conduct Discharge real quick.