U.S. Defense Secretary Leon Panetta, right, smiles as he is greeted by U.S. Ambassador to Afghanistan James B. Cunningham, center, and Marine Gen. John R. Allen, left, commander of International Security Assistance Force, upon arriving at Kabul International Airport in Kabul, Afghanistan, Wednesday, Dec. 12, 2012. Panetta is expected to meet with troops as part of a holiday visit to thank the troops for their service. (AP Photo/Susan Walsh, Pool)
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