>If only that were true, they wouldn't wage all of the senseless wars that the US has fought since WW2.
Take your low effort trope and shove it somewhere unpleasant.
Of course the war machine is gonna war. That's what they do. You don't see Newport making their cigs kill their customers faster unless there's something in it for them. The air force is the same way. They might be in the death business but they're not gonna go around wasting bombs on people who are no threat to anyone unless they think that's how they're gonna accomplish their goal, which you can pretty much guarantee they don't after 'nam.
Are you really so blinded by ideology that you can't see that no military wants to spend resources in a manner that does not help them achieve their goal? Spending the fewest resources to get the most done while forcing your enemy to waste his is one of the most basic concepts in military strategy.