When U.S. Army scout sniper Garett Reppenhagen got to Iraq, he realized that the rules of engagement he’d just learned in training had evaporated. Two Iraqi farmers trying to work their fields past curfew one night learned that at the point of a machine gun and belt-fed grenade launcher not even authorized for use on enemy combatants. They were only the first of many innocent civilians that Reppenhagen would see gunned down.