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The U.S. and NATO ceremonially ended their combat mission in Afghanistan on Monday, 13 years after the Sept. 11 terror attacks sparked their invasion of the country to topple the Taliban-led government.

NATO's International Security Assistance Force Joint Command, which was in charge of combat operations, lowered its flag, formally ending its deployment. U.S. Gen. John F. Campbell, commander of NATO and U.S. forces, said that the mission now would transition to a training and support role for Afghanistan's own security forces. From Jan. 1, the coalition will maintain a force of 13,000 troops in Afghanistan, down from a peak around 140,000 in 2011.

Lieutenant General Joseph Anderson, left, folds the flag of the International Security Assistance Force Joint Command during a ceremony in Kabul on Monday.Massoud Hossaini / AP

— The Associated Press