In this Friday, Sept. 26, 2014 photo, released by the U.S. Air Force, a U.S Air Force KC-10 Extender refuels an F-22 Raptor fighter aircraft prior to strike operations in Syria. The F-22s, making their combat debut, were part of a strike package that was engaging Islamic State group targets in Syria. (AP Photo/U.S. Air Force, Russ Scalf )
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