Another thing is the Army is exhausting their supply of people to send over... So they came up with a great idea... send the Air Force/Navy to do the non-combat (and sometimes convoys, I would say those are sorta combat) stuff like maintain the bases.
I read about this stuff in the AF Times when I was in Kuwait. They were saying that the SF (cops, probly for the convoys and related stuff) and CE (DPW in the Army, like me) are going to be hit up by this. Obviously it's true b/c I did it, and the team that replaced us was some Navy Seabees.