U.S. soldiers walk through the mountains on patrol in Afghanistan's northeastern Nuristan province in February. The U.S. military is beginning to pull troops out of remote areas such as Nuristan and move them to more populated areas. Spencer Platt/Getty Images hide caption

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U.S. Marines with Golf Company, 2nd Battalion, 3rd Regiment run to take position behind a building after being fired on by Taliban while on patrol in the village of Dahaneh, in Helmand province, Afghanistan, on Aug. 28. Julie Jacobson/AP hide caption

itoggle caption Julie Jacobson/AP