We had that when the Artillery guys and the Infantry guys got together.
Never went as far as automatic weapons or grenade launcher level though.
There is just something about this thread that is bumping against my funny bone...
I was never in the military but how do you have a fist fight and use grenade launchers as well?
A fist fight is hand to hand, as personal as it gets.
A grenade launcher is what, 50 to 100 yards?