Brian Neuman was a construction worker whose first reaction when he saw the 9/11 attacks was: "I'm going back in," and within weeks he was headed to his old Army Ranger division. "Even in combat, you don't think your entire world could change in the next minute," he said. "I knew we were going to war after that, and I said I want to do this, to be part of this," said Neuman, 34. "I wanted to be the one signing up to go over there rather than some 18-year-old kid who doesn't know what they're doing." He had spent...