SASLess,
Lots of work with X engines, mostly. Some fod, some with bullet holes, one with a pair of duckbills that went right into the combustion chamber, thanks to a careless E-4.
Experimental installations, experimental fuel controls (flew one helo with two controls for each engine - switched in flight!) stalls, exhaust streaking, and the like.
Keeps you on your toes - boredom is not one of the occupational hazards!