You got that right about Koreans,
When I was in VN , about 100yds from me a ROK Lt shot a ROK
trooper dead while he was sleeping on guard at line on the perimiter line.
Doubt there was any more sleeping on guard, I know I didn`t.
I've heard that in the Korean military a beating often occurs in cases where in America there would only be yelling. I hadn't heard about the shooting part.