In this Tuesday, Sept. 23, 2014 photo released by the U.S. Air Force, a U.S. Navy F-18E Super Hornet receives fuel from a KC-135 Stratotanker over northern Iraq after conducting airstrikes ias part of U.S. led coalition airstrikes on the Islamic State group and other targets in Syria. U.S.-led airstrikes targeted Syrian oil installations held by the militant Islamic State group overnight and early Thursday, Sept. 25, 2014, killing nearly 20 people as the militants released dozens of detainees in their de facto capital, fearing further raids, activists said. (AP Photo/U.S. Air Force, Staff Sgt. Shawn Nickel)