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Associated Press
Defense Secretary Chuck Hagel walks with U.S. Ambassador to Afghanistan James Cunningham, left, and Gen. Joseph Dunford, center, Commander of the International Security Force, upon Hagel's arrival in Kabul, Afghanistan, Friday, March 8, 2013. Hagel arrived in Afghanistan Friday for his first visit as Pentagon chief, saying that there are plenty of challenges ahead as NATO hands over the country's security to the Afghans.  (AP Photo/Jason Reed, Pool)

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