FILE - In this May 2, 2012 file photo, President Barack Obama and Afghan President Hamid Karzai walk together after they signed a strategic partnership agreement at the presidential palace in 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/Charles Dharapak, File)

Associated Press
FILE - In this May 2, 2012 file photo, President Barack Obama and Afghan President Hamid Karzai walk together after they signed a strategic partnership agreement at the presidential palace in 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/Charles Dharapak, File)
FILE - In this May 2, 2012 file photo, President Barack Obama and Afghan President Hamid Karzai walk together after they signed a strategic partnership agreement at the presidential palace in 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/Charles Dharapak, File)
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