Yeah American military obviously always drew on lower classes to bulk out its infantries, but that seems even more so the case today. GI bill stuff is amazing, get those kids educated, and I personally know two guys who grew up dirt-poor, always caught up in trouble with the law—going into military best thing that ever happened to them, straightened them out + got them into college, welcome to the middle class. But that's in relative peacetime, and if blood is being shed, its theirs, i.e. any nice incentive-for-the-disadvantaged we pad military service with is also something that further distorts demographics.