A U.S. Air Force F-15C Eagle fighter aircraft assigned to the 104th Fighter Wing, Barnes Air National Guard Base, Mass., is refueled by a U.S. Air Force KC-135 Stratotanker assigned to the 916th Air Refueling Wing, Air Force Reserve Command, Seymour Johnson, N.C., over Iceland while conducting Icelandic Air Surveillance operations, April 9, 2016. Missions like the IAS showcase the U.S. Air Force’s global presence in deterring potential threats and bringing peace and stability to allied nations. (U.S. Air Force photo by Master Sgt. Kevin Nichols/Released)