An Air Force F-15C Eagle assigned to the 493rd Expeditionary Fighter Squadron taxis down the flight line at Keflavik Air Base, Iceland, Aug. 1, 2018, in support of NATO’s Icelandic Air Surveillance mission. NATO allies deploy aircraft and personnel to support this critical mission three times a year, with the U.S. responsible for at least one rotation annually. Air Force photo by Staff Sgt. Alex Fox Echols III