Boslandew
"Would it be acceptable to lose this war because we were saving resources to fight future unknown wars?"
I don't really think that you have thought about this question.
Perhaps if I rephrase it slightly the answer will become clear.
Would it be acceptable to lose this war that doesn't really matter to the continued survival of our country, and that we are not really sure why we are in apart from to support our buddies, who themselves are a bit ambivalent about it and we could pull out of tomorrow with no more damage and loss of life to our troops other than a bit of pride, because we were saving resources to fight future unknown wars which might actually affect the lives of our nearest and dearest?