As an active duty C-130 Crew Chief with 28 years experience, I would be remiss if I didn't suggest you check out Air Force tactical airlift maintenance. With the C-130's airlift, airdrop, and aeromedical evacuation missions (plus another dozen or so specialized missions), it's the closest an aircraft mechanic will come to combat. Plus you can choose between the Air National Guard, AF Reserve and active duty.
Proud member of the YCHJCYA2PDTHFH club.
My mechanic told me, "I couldn't repair your brakes, so I made your horn louder."