Boeing proposed a 747 adapted as an aerial refueling tanker during the 1970s Advanced Cargo Transport Aircraft (ACTA) program that produced the McDonnell Douglas KC-10A Extender for the USAF. This is a summary of the aircraft modifications and flight tests of the proposed KC-33.
Ultra low altitude air refueling of an F-4 Phantom by a KC-135E.
During Operation Creek Party (out of Rhain MAin AB). The Recon Rhino shows the tailcode of Zweibrücken Air Base, Germany. RF-4C 68-0556 was w/o 8 June 1983 while based at RAF Alconbury U.K. The 126 ARS operated KC-97F from August 1961 and the KC-97L from March 1965. They went to KC-135A in December 1977.