Associated Press
FILE - In this Jan. 28, 2016 file photo, Defense Secretary Ash Carter speaks during a news conference at the Pentagon. To doubters of its strategy for defeating the Islamic State , the Obama administration likes to tout its coalition of 66 nations and claim strength in numbers. But a year and a half into the war, some administration officials are acknowledging that this supposed source of strength has its own weaknesses.  (AP Photo/Cliff Owen, File)

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