Military acft actually rack up a lot less time than civil air carriers. About the highest Mil acft times I've heard of are the C-141's with 45,000 hrs, at 40 years old. The flip side is landing the cycles, which is more than triple most civil acft, for equivalent time. The military loooooooves touch and goes, and it is very common to do 10 or 15 on a 4 hr training sortie. The KC
-10 is one example, at 20 years old, most of them average around the 17,000 hr mark, but our landing cycles are up around 10,000. The result is the ASIP (Aircraft Structural Integrity Program) models which predict stress area concentrations, show the KC
-10 with the same levels of fatigue as the DC-10-30F's with twice the hours, but half the landings.
Hope it helps!