Spc. Ashley Pullen wasn't thinking about the dozens of Iraqi insurgents who had just ambushed the convoy. Or their piles of guns and grenades or the bullets ripping through the air around her. Her bloody comrade lay on the road south of Baghdad, and she had to help the gravely wounded soldier — fast. So she hustled as quickly as her short legs would carry her, ignoring the heat, the ferocious battle and her heavy gear. She ran 100, 200, 300 feet — the length of a football field. It was March 20, 2005, the day Pullen, a member of...