You raise a very real question, but the point to not in that respect is that most US military spending has been paid for by others, via huge deficits and massive forieng borrowing. China, Russia, Japna and Saudi Arabia are paying for America's weapons and soldiers. In principle, it's debt, to be repaid, but that's quite a bet to take, to use your own surpluses to arm the biggest bully around.

In the long run, we're all dead. John Maynard Keynes