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. Washington and its Arab allies opened the air assault against the extremist group on Sept. 23, striking military facilities, training camps, heavy weapons and oil installations. The campaign expands upon the airstrikes the United States has been conducting against the militants in Iraq since early August. (AP Photo/U.S. Air Force, Russ Scalf )
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