I had a very anti-war sociology professor that had been protesting since vietnam. Despite his qualms with military industrial complex, he would always say that the the military is the last vestige of upward mobility in the united states as it’s one of the few places where you can enter a playing field that is somewhat leveled for new entries, have merit impact your growth, and get access things like subsidized education. Sure there’s still racism, sexism, etc. but in terms of economic mobility it provides a decent ladder.