When Jez Clay's twin brother was mortally wounded by a Taliban sniper, he made a last request. "Promise me you'll get revenge. Take him out." A hunter and a marksman, Jez was duty bound to honor his promise, and he did it the only way he knew how. He took his brother's military identity, joined his unit, and made the kill. At first a grateful Army promoted him to sergeant. Yet the Pentagon had other ideas. He broke the rules, and they want him to...