It was May 10, 1970, in Se San, Cambodia. Spc. Leslie H. Sabo Jr. and his platoon were ambushed by a large enemy force. The 22-year-old rifleman from Ellwood City, Pa., charged the enemy position, killing several soldiers, and then attacked an enemy flanking force, drawing fire away from his comrades. As the enemy retreated, a grenade landed near Sabo and a wounded American soldier. Sabo picked it up and threw it, while shielding his comrade with his own body. The grenade blast badly injured Sabo, but he continued to charge the bunker. Crawling toward the enemy stronghold, Sabo was...