FILE - In this Nov. 28, 2012 file photo, U.S. soldiers with stand guard as they watch the transfer ceremony of security responsibilities from NATO troops to Afghan security forces in Qalat, Zabul province south of Kabul, Afghanistan. The debate over how many U.S. troops will remain in Afghanistan after 2014 comes down to risk. Leaving too few troops in place could stall progress for Afghan security forces. But keeping too many troops there might prolong Afghanistan's dependence on the U.S. military and NATO. (AP Photo/Allauddin Khan, File)
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