At a road project in Qalat, Afghanistan, last summer, U.S. forces were providing security. U.S. Air Force Staff Sgt.Brian Ferguson /Reuters /Landov hide caption

itoggle caption U.S. Air Force Staff Sgt.Brian Ferguson /Reuters /Landov

Marines with Echo Company of the Second Battalion, Ninth Marines out of Camp Lejeune, guide their M-ATV, a Mine Resistant Ambush Protected vehicle in to the district government compound in Marjah, Afghanistan. David Gilkey/NPR hide caption

itoggle caption David Gilkey/NPR

President Obama shakes hands with with Afghan President Hamid Karzai during their meeting at the NATO Summit in Chicago on Sunday. The summit, which continues Monday, is focusing heavily on Afghanistan's future. Pablo Martinez Monsivais/AP hide caption

itoggle caption Pablo Martinez Monsivais/AP

Officials and mourners prepare to place the coffin of Afghanistan High Peace Council and former Taliban leader Arsala Rahmani in a grave earlier today, in Kabul. Massoud Hossaini /AFP/Getty Images hide caption

itoggle caption Massoud Hossaini /AFP/Getty Images

Former Taliban fighters displayed their weapons as they joined Afghan government forces during a ceremony in Herat province last Wednesday ( May 2, 2012). Aref Karimi/AFP/Getty Images hide caption

itoggle caption Aref Karimi/AFP/Getty Images