Cpl. Clifford Wooldridge USMC, Navy Cross
There's a great image macro at the bottom of the link.As he crouched back behind the wall to reload, he saw the barrel of an enemy machine gun appear from around the wall. Without hesitation, he dropped his empty weapon and seized the machine gun barrel. He overwhelmed the enemy fighter in hand-to-hand combat, killing him with several blows to the head with the enemy's own machine gun.