A 492nd Fighter Squadron F-15E Strike Eagle flies over a Greek F-16C Fighting Falcon on its way back to Royal Air Force Lakenheath, upon departing Los Llanos Air Base, Spain, Jan. 29, 2015. The 492nd FS left Spain upon the cancellation of Tactical Leadership Programme 2015-1, a NATO exercise that develops leadership and interoperability amongst allies. The training event was cut short after 11 airmen from the Greek and French air forces lost their lives following an aircraft crash. (U.S. Air Force photo by Airman 1st Class Erin R. Babis/Released)