International Security Assistance Force (ISAF) Commander Gen. Joseph Dunford, center, greets outgoing 

International Security Assistance Force (ISAF) Commander Gen. Joseph Dunford, center, greets outgoing U.S. Secretary of Defense Leon Panetta following their arrival at NATO headquarters, Brussels, Thursday, Feb. 21, 2013. Panetta is in Brussels Thursday to attend a NATO Defense Ministers Meeting. (AP Photo/Chip Somodevilla, Pool)
Associated Press
International Security Assistance Force (ISAF) Commander Gen. Joseph Dunford, center, greets outgoing U.S. Secretary of Defense Leon Panetta following their arrival at NATO headquarters, Brussels, Thursday, Feb. 21, 2013. Panetta is in Brussels Thursday to attend a NATO Defense Ministers Meeting. (AP Photo/Chip Somodevilla, Pool)
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