That's because the Marines are looking for GOOD MEN, not any chump that can score a scholarship.
Bear in mind FQ, it's hard to get washed out, but they make it easy for you to quit.
As it should be. Robert Heinlien had it right in "Starship Troopers". You don't serve, you don't vote. More than that, there's no draft, and you can quit any time you want up until deployment. Beyond that, you're in. That's what made me lean Marine more than Army. Hell, I never wanted to be Rambo, my MOS peference for both was the same, intel, ordinance and transport in that order. I just wanted to serve, get my scholarship, and get out. But, the tail is as important as the teeth, . I liked the ethos of the Marines, particularly on the enlisted side, but not enough to spend an extra year in school taking math classes I'd never use. Army it was, but we were, in all honesty, a flabby bunch, at least among the lower classmen who hadn't been given the two year "get the f@ck off my obstacle Pyle" eval. Upper classman to upper classman, we were fine, but feshman to freshman, the Marines kicked our ass.
FQ13