"Make a man out of you" was, based on the very small number of people I knew who either did straighten up and fly right after selecting Door #1, a path they seemed to be searching for anyway. Those that did not were the sort of folk you wanted to be sure there was a war for them to participate in and that they would be assigned as ground pounders.
A story kept going around about a certain 0311 who was supposed to have been a serious delinquient having "found his home" in combat. Or was that Robert Mitchum, Steve McQueen (the ones I can recall right now), or about half a zillion characters dreamed up by scriptwriters?
stay safe.