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KABUL, AFGHANISTAN - JULY 4: Detail of uniform worn by US General David Petraeus, Commander of NATO forces in Afghanistan, while attending an Assumption of Command Ceremony at the International Security and Assistance Force (ISAF) Headquarters on July 4, 2010 in Kabul, Afghanistan. Appointed by US President Barack Obama (following the dismissal of US General Stanley McChrystal), US General David H Petraeus formally took up his new role of commander of the Afghan war and the 140,000 foreign troops serving in Afghanistan during a ceremony at NATO headquarters in Kabul, in which colours of US and NATO forces were handed to him by German Army General Egon Ramms, Commander of NATO's Allied Joint Forces Command Brunssum. (Photo by Majid Saeedi/Getty Images)

KABUL, AFGHANISTAN - JULY 4: Detail of uniform worn by US General David Petraeus, Commander of NATO forces in Afghanistan, while attending an Assumption of Command Ceremony at the International Security and Assistance Force (ISAF) Headquarters on July 4, 2010 in Kabul, Afghanistan. Appointed by US President Barack Obama (following the dismissal of US General Stanley McChrystal), US General David H Petraeus formally took up his new role of commander of the Afghan war and the 140,000 foreign troops serving in Afghanistan during a ceremony at NATO headquarters in Kabul, in which colours of US and NATO forces were handed to him by German Army General Egon Ramms, Commander of NATO's Allied Joint Forces Command Brunssum.  (Photo by Majid Saeedi/Getty Images)