I'll just say it's a Dutch stereotype, but that isn't fully right, so I'll try to explain it. IDK if anyone will read it, but oh well *shurg*
Drill sergeants/drill instructors are the people who train new recruits in bootcamp for all branches. Army and Marines have the harshest DSs/DIs, but Navy and Air Force still have some element of harshment. I'll use Marine DIs and bootcamp as an example because that's what I'm going to, though it is the most extreme example because the Marine bootcamp is the harshest.
The DIs literally break down the recruits, it's their job to. There is the occasional suicide in bootcamp it's so harsh. Pretty much every recruit cries at bootcamp. It's as close to hell as the DIs can make it. Why? Because war *is* hell, and that's what a Marine is trained for. War. The DIs break down the recruits, striping away their identity, their habits, their excuses, and through the pain of bootcamp, turns then into warriors, people ready, able, and trained to kill if needed. It isn't nice in the slightest, but it produces some of the finest warriors in the world.
Things get easier after bootcamp. Once you get to the fleet (when all your initial training is done), there are still standards, but you don't get treated like shit. You're not a recruit, you're a Marine.
Hope that helped