Liberty Airmen from the 492nd Aircraft Maintenance Unit and the 492nd Fighter Squadron bid their comrades farewell, as they prepare for departure in an F-15E Strike Eagle at Los Llanos Air Base, Spain, Jan. 29, 2015. The 492nd FS was in Spain for NATO’s 2015 Tactical Leadership Programme, which was cut short due to an aircraft crash on Jan. 26, 2015. (U.S. Air Force photo by Airman 1st Class Erin R. Babis/Released)