When I was a young boot poole a few hams got rejected because they couldn't pass an IST (initial strength test (a measly 2 pull ups 1.5 mile run in under like a thousand years and some arbitrary but low number of sit ups))  Anyways if you pass that and make it to fleet and are still a fatty you go on bcp (body composition platoon) on that you pt twice as much, everyone knows your a fat body (as if they couldn't tell) and you get nonrec'd (no promotions). I knew a guy who did five years as an E fucking 1. Five years as the lowest rank doing the shittiest work.  Anyways towards the end of my time in they were really cracking down on fatties and alcoholics and the like.