 In July 1956 the 603d ACW departed for Langerkopf AS, and the RADAR station was taken over by the 602d Aircraft Control and Warning Squadron, which moved in from Birkenfeld AS.With the arrival, Giebelstat was upgraded to the AN/FPS-20 General Surveillance Radar and the AN/FPS-6 Long-Range Height Finder Radar.Starting in 1956 Central Intelligence Agency Lockheed U-2 reconnaissance aircraft flew from the airfield in support of operation AQUATONE/OILSTONE.