The work is pretty cool at times. The contractor I work for does the maintnance on all the helicopter fleet used to train pilots at Ft Rucker but we also support the test aircraft at the Aviation Technical Test Center (ATTC). The main contract employee 3000+ and we're about 300 total.
I've been traveling the USA for the last 18 years, 3 to 9 months a year, with three different employers over that time. The contract is bid every 5 years or so depending on how happy the Army is with the contractor.
It's a little easier to do the job when you know a lot of the work done helps our armed men and women serve for our freedom and help keep them alive doing so.