When I was in (as an 81150 Security Policeman) we were issued live rounds for our deployments to the MinuteMan sites. I don't recall ever dragging my rifle through the mud, or leaning on it.
They had an SP drop his weapon and haul ass when I was at Lakenheath RAF in the early 80's. We used to ride around in the backs of pickups when we were loading bombs and needed to be transported from our hangar to the flightline and back. The truck would pull up to the gate, and the SP would check our flight-line badges. One night on the mid-shift (after midnight) some wiseass bomb-loader put on a gorilla mask and hid down along the high sides of the pickup bed. While the SP was checking everyone's badges, gorilla mask popped up screaming and waving with no warning. The SP dropped his Mini-14 and ran to his shack. He recovered after a few seconds, but the damage was done. I heard he got in major trouble, but so did gorilla man + his buddies. They were from the other squadron so I didn't know any of them. In retrospect, this joke could have ended tragically.
Correctamundo. Hasn't been an airplane with a turret in service since they pulled the stingers off the B-52s, and no fighter has been built with one since the early 1940s.