A QF-4 Drone sits on the flight line June 3, 2015 at Holloman Air Force Base, N.M. The F-4 Phantom II first began flying in 1958 and is most famous for its performance in the Vietnam War. The F-4 officially retired in 1996 and now all operational Air Force F-4s have been converted to QF-4 Drones, which serve solely as remotely controlled unmanned targets for air-to-air and ground-to-air weapons systems evaluations, development and testing. QF-4s can also be flown as a conventionally manned fighter. (U.S. Air Force photo by Airman 1st Class Emily A. Kenney/Released)