LEEDS, Mass. (AP) - Peter Mohan traces the path from the Iraqi battlefield to this lifeless conference room, where he sits in a kilt and a Camp Kill Yourself T-shirt and calmly describes how he became a sad cliche: a homeless veteran. There was a happy homecoming, but then an accident—car crash, broken collarbone. And then a move east, close to his wife's new job but away from his best friends. And then self-destruction: He would gun his motorcycle to 100 mph and try to stand on the seat. He would wait for his wife to leave in the morning,...