Oh, c'mon. Give the guy a break. I'm sure it takes a lot of highly technical training to become proficient in weapons repair.
REMF does stand for Rear Echelon Mortar Fixer, right? :=)
HAHA! Yeah, with his intellect, he'd fit right in with the Gun Grapes.
As we Engineer types would say to the Arty types, "Uhhh, pull string, gun go boom!"