SAMARRA, Iraq - The gunfight by the Tigris River was over. It was time to retrieve the bodies.
Staff Sgt. Cortez Powell looked at the shredded jaw of a dead man whom he'd shot in the face when insurgents ambushed an American patrol in a blind of reeds. Powell's M4 assault rifle had jammed, so he'd grabbed the pump-action shotgun that he kept slung over his shoulders and pulled the trigger.