What about discussing serving Airmen? Plenty of those scattered throughout the ATC. In my school we had other ranks from both the Army and RAF trained up from non flying to "C" cat and beyond. In fact, one Army ground trade Cpl. (not AAC) is now flying (AFAIR) Apache helicopters. (At first he was a bit taken aback, when one of our staff, a serving SO, uttered those famous words "call me Dave")