"U. S. Defense Secretary Ash Carter addresses the U.S. troops at the Incirlik Air Base near Adana, Turkey, Tuesday, Dec. 15, 2015. Carter said the U.S. wants Turkey to better control its border with Syria, which could help block the flow of foreign fighters to the Islamic State group, and to more forcefully join the U.S.-led coalition ""in the air and on the ground."" (AP Photo)"
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