FILE - In this Wednesday, March 9, 2011 file photo, Gen. David Petraeus, then top commander of U.S. and NATO forces in Afghanistan, arrives for an interview at the NATO's head quarter i

 

              FILE - In this Wednesday, March 9, 2011 file photo, Gen. David Petraeus, then top commander of U.S. and NATO forces in Afghanistan, arrives for an interview at the NATO
FILE - In this Wednesday, March 9, 2011 file photo, Gen. David Petraeus, then top commander of U.S. and NATO forces in Afghanistan, arrives for an interview at the NATO's head quarter in Kabul, Afghanistan. Nearly two dozen generals have commanded troops from the United States and the NATO-led International Security Assistance Force, since the American invasion in late 2001. While some analysts say fresh eyes are important, others wonder if the revolving door command has hurt U.S. continuity with critical Afghan partners. (AP Photo/Musadeq Sadeq, File)
Tags: NATO , States