Who is Young Corporal from Welcome to the Monkey House and what is their importance?

The corporal is the most volatile of the enlisted men. He has a tantrum when Pi Ying explains the rules and has to be held down by the Sergeant. Before Kelly reveals Pi Ying's plan, the corporal doesn't believe that anyone would dare harm an American. When the game begins, he is difficult and untrusting of Kelly's commands. However, a threat from Pi Ying to have him tortured forces him to play along, even if defiantly.