It's a technique borrowed from the French "Military". The idea is to allow your opponent to hit you repeatedly. They will inevitable injure their hands and feet, and exhaust themselves. These two missed a crucial step though; the French system involves running away once your opponent's toes are broken.

That's American marines..

idk if this is the case but i know for sure that when a soldier gets in any form of violence against civilian, they will be sent to the military prison. Because even though soldiers are human too but soidlers&civilian issue is a very sensitive relation. Idk about the US military, but my friends in South Korean Marines say they sometimes get taunted by dumbass high school kids and can't even lay a finger on them because that will get them in some serious trouble with the military. Soldiers are there to protect the civilians.. so If they fight he civilian,, they are going against the very reason of their existence. Remember few years ago an american soldier who returned from the war witnessed a man beating his wife, he went and beat up the husband to save the wife, but he ended up in military prison.

Discharge? Well all i know is, inside or outside of the ring, You must protect yourself at all time.