Spring 2007: chaos threatened to swallow all of Baghdad. Sunni and Shi'a insurgents, devoted to their jihad to rid Iraq of the United States and its Western allies, were now raging against each other in a bloodbath of sectarian violence not seen in years. As if Mike Win didn't have enough to worry about. A member of a cutting edge U.S. Army Stryker battalion, the "Tomahawks," Captain Win, freshly stripped of his platoon for criticizing his superiors,...