Did two tours in Korea. Came into contact with the KATUSA and the regular army troops.

The KATUSA were college age kids who had parents who could afford to pay the kid's way into the program. Sorry physically, good academically, spoke passable English. They augment the US troops in most but not all jobs. I suspect the more mom and dad paid, the better the job junior got.

The Korean regular army is tougher than woodpecker lips. I think they teach all the troops to swim iirc. And when I was there (90s) service was pretty much mandatory.

As to the teen set, no clue.

This was a travesty as to the captain's and crews conduct. Should be held criminally and civilly liable. And iirc the weather there is still sorta cold and nasty. Spring hits end of April/early Mayish.