Tunnel Rat: Sergeant Ronald Payne, 21, of Atlanta, Georgia, emerges from Viet Cong tunnel holding his silencer-equipped revolver with which he fired at guerrillas scurrying ahead of him underground. Payne and others of the 196th Light Infantry Brigade propped the massive tunnel in Hobo Woods, South Vietnam, and found detailed maps and plans of the enemy. The infantrymen who explored the complex are known as "tunnel rats." They were called out of the tunnels today and nauseating gas was pumped in, January 21, 1967