FILE - This June 19, 2012 file photo shows a US soldier, part of the NATO forces, patrols a police station in Kandahar, south of Kabul, Afghanistan. U.S. troops are still in Afghanistan, nearly 11 years after they invaded. Why? The answer boils down to one word: al-Qaida. The goal is to damage the terrorist group enough to prevent a repeat of the 9/11 attacks. (AP Photo/Allauddin Khan, File)

Associated Press
FILE - This June 19, 2012 file photo shows a US soldier, part of the NATO forces, patrols a police station in Kandahar, south of Kabul, Afghanistan. U.S. troops are still in Afghanistan, nearly 11 years after they invaded. Why? The answer boils down to one word: al-Qaida. The goal is to damage the terrorist group enough to prevent a repeat of the 9/11 attacks.  (AP Photo/Allauddin Khan, File)
FILE - This June 19, 2012 file photo shows a US soldier, part of the NATO forces, patrols a police station in Kandahar, south of Kabul, Afghanistan. U.S. troops are still in Afghanistan, nearly 11 years after they invaded. Why? The answer boils down to one word: al-Qaida. The goal is to damage the terrorist group enough to prevent a repeat of the 9/11 attacks. (AP Photo/Allauddin Khan, File)
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