Vietnam, April 15, 1969. At first light, the air over Firebase Diamond III was full of dust from four hours of incoming artillery shells exploding around the perimeter. Alpha and Delta companies fought for their lives during the ground attack. The air was thick with the smell of napalm from the jet air strikes. The men sat behind their bunkers, staring blankly across the open rice paddies looking for remnants of the two battalions of NVA soldiers that hurled themselves at the firebase. The men...