FILE - In this Sept. 11, 2011 file photo, US soldiers sit beneath an American flag just raised to commemorate the tenth anniversary of the 9/11 attacks at Forward Operating Base Bostick in Kunar province, Afghanistan. After 20 years of military engagement and billions of dollars spent, NATO and the United States still grapple with the same, seemingly intractable conundrum — how to withdraw troops from Afghanistan without abandoning the country to even more mayhem. (AP Photo/David Goldman, File)
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