Gimme 300 i cant think of an airline that uses QFE now and the latest NG737 flight manual warns you not to use QFE as the FMC will not like it !(can the C17 use QFE?) I can see that QFE could be a good thing for the fast jet people who dont have ILS and the only option would be a PAR but for the rest of the militry i cant see how the height above the runway helps you avoid all the other obstructions.
I have to say that i think that changing the setting of the altimeter at a critical and high workload stage of flight is asking for trouble but i am willing to be enlightend on this subject.