FILE PHOTO: A Turkish Air Force F-16 fighter jet ( C foreground) is seen between U.S. Air Force A-10 Thunderbolt II fighter jets at Incirlik airbase in the southern city of Adana, Turkey, December 11, 2015. REUTERS/Umit Bektas
FILE PHOTO: A Turkish Air Force F-16 fighter jet ( C foreground) is seen between U.S. Air Force A-10 Thunderbolt II fighter jets at Incirlik airbase in the southern city of Adana, Turkey, December 11, 2015. REUTERS/Umit Bektas