Navy Lt. j.g. Bradley Pate thought he was finished. Taliban fighters had ambushed the convoy of his humanitarian-aid team in an Afghan mountain pass, wounding half of the 30-member group Nov. 2, 2006. Pate and the remaining team hunkered down that night, waiting for the next battle. As the sun rose, a mortar shell exploded in the middle of its encampment. Pinned down by rifle and mortar fire, Pate heard the screams of bleeding troops around him. Then he spotted a badly wounded Air Force captain lying in the open. Pate raced out and dragged the captain to relative safety...