Yeah we had somebody do something like this... In Afghanistan!
Guy went on a short convoy from one PB (patrol base) to another PB just down the road. Finished their crap and were back on the road when they received a radio call "Uh (won't mention the persons name), where's your rifle?"
Wasn't there to see it personally but I'm sure he had to clean his cammies after that one. I also know of a 2LT platoon commander who got relieved of his command for doing the same thing.
Sgt. of Marines, 5th Award Expert Rifle, 237/250
1st Award Expert Pistol, 382/400
D Co, 4th CEB, Engineers UP!! OEF 21JUN-20SEP2011