Commander of the International Security Assistance Force (ISAF), Gen. John Campbell, center, cases the ISAF flag during a ceremony at the ISAF headquarters in Kabul, Afghanistan, Sunday, Dec. 28, 2014. The United States and NATO formally ended their war in Afghanistan on Sunday with the ceremony at their military headquarters in Kabul as the insurgency they fought for 13 years remains as ferocious and deadly as at any time since the 2001 invasion that unseated the Taliban regime following the Sept. 11 attacks. (AP Photo/Massoud Hossaini)
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