The worst moment in Gary Stokes' life was not the day a couple of Marines in dress uniform showed up at his door to tell him his son had been killed in Iraq. That was bad, no doubt. He had spent two years wondering whether he would receive those unwelcome visitors. The worst moment came later, after the tears and the grief. The worst moment came slowly. It was the horrible realization that Sean was gone forever. He would never see his son again. Never again go fishing or camping, or watch him get married and have children of his...