In this Jan. 28, 2012, photo, U.S. soldiers, part of the NATO- led International Security Assistance Force (ISAF) patrol west of Kabul, 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/Hoshang Hashimi) **FILE**
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