We are the reason other countries don't need a military, and we made it that way on purpose. After WW2 we basically said "sign here and we will be your military" and because of that, we have the strongest economy of everyone. We spend LESS per GDP on Military than some countries. Okay, in gross we spend way more, but look at the percentages and we spend less. We gave ourselves the responsibility of many nations security, and because of that we need to spend more. We make the world better and safer because of it. What do I mean by that? Well, since other countries don't need to invest heavily in military, they can afford healthcare and such, and safer is since most countries don't have strong militaries, you don't see France and Italy in a war, since they literally don't have the strength to.