U.S. Marine Gen. Joseph F. Dunford (right) shakes hands with U.S. Marine Gen. John Allen (left), the outgoing NATO commander, during a change-of-command ceremony at the International Security Assistance Force headquarters in Kabul, Afghanistan, on Sunday, Feb. 10, 2013. Gen. Dunford takes charge at a critical time for President Obama and the military as foreign combat forces prepare to withdraw from Afghanistan by the end of 2014. (AP Photo/Massoud Hossaini, Pool)

Photo by: Massoud Hossaini

U.S. Marine Gen. Joseph F. Dunford (right) shakes hands with U.S. Marine Gen. John Allen (left), the outgoing NATO commander, during a change-of-command ceremony at the International Security Assistance Force headquarters in Kabul, Afghanistan, on Sunday, Feb. 10, 2013. Gen. Dunford takes charge at a critical time for President Obama and the military as foreign combat forces prepare to withdraw from Afghanistan by the end of 2014. (AP Photo/Massoud Hossaini, Pool)