The convoy had come under Iraqi fire, so the Marines were scrambling to set up a defensive position. Nate Winkler had a technical job, but he was still a Marine in a battle. When his buddy appeared from further back in the column, he had a wound on his face. "I'll tell you later," was all he could get out of him. Later, with the convoy back on the move, there was a grim realization that made everyone feel guilty. Part 2 of 3. (7:58)