FILE - In this Dec. 12, 2012, file photo, U.S. Defense Secretary Leon Panetta, right, shakes hands with Marine Gen. John R. Allen, left, commander of International Security Assistance F

 

              FILE - In this Dec. 12, 2012, file photo, U.S. Defense Secretary Leon Panetta, right, shakes hands with Marine Gen. John R. Allen, left, commander of International Security Assistance F
FILE - In this Dec. 12, 2012, file photo, U.S. Defense Secretary Leon Panetta, right, shakes hands with Marine Gen. John R. Allen, left, commander of International Security Assistance Force, as U.S. Ambassador to Afghanistan James B. Cunningham, center, watches, upon Panetta's arrival at Kabul International Airport in Kabul, Afghanistan. U.S. troop deaths in Afghanistan have plunged to the lowest level in four years, reflecting a pullback from direct combat into the less deadly role of advising and assisting Afghan forces as they do more of the fighting. Attacks by the Taliban insurgents also have been declining, although the war is far from finished. (AP Photo/Susan Walsh, Pool)