>Also anecdotally - but maybe someone with closer knowledge can corroborate - army divisions (?) want to maintain their budgets from cycle to cycle, and to do so they need to prove that they _need_ that money. I have heard that the Air Force, as an example, will rapidly spend down their budgets at the end of a budget cycle by dropping jet fuel and firing off missiles willy nilly.

This is true for all large organizations in existence, both on the military and civilian sides of government and in large corporations.