U.S. Air Force Airmen from the 633rd Civil Engineer Squadron smooth out concrete for the new F-15 Eagle static display at Langley Air Force Base, Va., Oct. 17, 2014. The F-15 Eagle on display commemorates Langley’s past, as the aircraft was flown here since 1976 before the F-22 Raptor took its place in 2010. (U.S. Air Force photo by Senior Airman Austin Harvill/Released)