Been out awhile, but the Army used to be pretty good at keeping pilots humble. As good as can be expected, anyway, starting with the personality type needed to make a decent combat pilot. Began from day one at flight school and continued throughout my career. Army pilots aren't big shots outside their very small world and Big Army isn't bashful about reminding them of that.
I wouldn't make the claim that Army pilots individually are "the best," but I'd challenge you to name another flight training program that has more experience producing professional helicopter pilots. They probably have a pretty good idea by now what kind of candidate will be successful and they probably have an idea about the most efficient way to get there. I'd wager that, over time, they turn out a consistently higher percentage of good helicopter pilots than anybody else. I can't think of who'd be a close second. They know what works.