FILE - In this Monday, July 18, 2011 file photo, Gen. David Petraeus, then top commander of U.S. and NATO forces in Afghanistan, salutes during a changing of command ceremony from Petraeus to Gen. John Allen 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, File Sadeq)

Associated Press
FILE - In this Monday, July 18, 2011 file photo, Gen. David Petraeus, then top commander of U.S. and NATO forces in Afghanistan, salutes during a changing of command ceremony from Petraeus to Gen. John Allen 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, File Sadeq)
FILE - In this Monday, July 18, 2011 file photo, Gen. David Petraeus, then top commander of U.S. and NATO forces in Afghanistan, salutes during a changing of command ceremony from Petraeus to Gen. John Allen 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, File Sadeq)
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