So who is going to the Guarding? Every arm of the services are down to the bare bones, do you really think if the Army had the man power they would give your guys these jobs?
Bear in mind that while you are on guard "inside" the wire your "Rocks" or Army guys are outside and not able to do both.
FWIW the Junglie maintainers, service the aircraft and protect the locations, the pilots and crewman all pitch in too.
Just put it down to overstretch like the rest of us and get on with it. Can't see things changing.