and updated weapons systems continued to join the USAF. The B-1B Lancer was delivered to SAC in record time, though with significant problems that would hamper its service career for some time. Stealth technology found its way to the ramps in the form of the F-117 Nighthawk fighter-bomber and the B-2 Spirit bomber. After the Space Shuttle Challenger disaster, AFSC helped restore the nation's space launch capability by quickly making available a family of new expendable launch vehicles such as the Delta II. Major gains were made in operational readiness rates through the Reliability and Maintainability (R&M) 2000 program. Inactivation With the 1992 reorganization of the Air Force, the functions of AFSC and Air Force Logistics Command (AFLC) were once again merged into the new Air Force Materiel Command (AFMC). Lineage Established as Research and Development Command on 23 January 1950 Organized as a major command on 1 February 1950 Re-designated: Air Research and Development Command on 16 September 1950 Re-designated: Air Force Systems Command on 1 April 1961 Inactivated on 1 July 1992. Assignments Air Materiel Command, 23 January 1950 United States Air Force, 1 February 1950 – 1 July 1992 Stations Baltimore, Maryland, 23 January 1950 Andrews Air Force Base, Maryland, 24 January 1958 – 1 July 1992. Command bases and major units Brooks AFB, Texas, 1 November 1961 – 1 July 1992 USAF Aerospace Medical Center Museum of Flight Medicine USAF Human Resources Laboratory USAF Medical Service Center Edwards AFB, California, 2 April 1951 – 1 July 1992 USAF Flight Test Center USAF Test Pilot School USAF Rocket Propulsion Laboratory 412th Test Wing Eglin AFB, Florida, 1 December 1957 – 1 July 1992 USAF Armament Development Test Center 3246th Test Wing Griffiss AFB, New York, 2 April 1951 – 1 July 1954 Rome Air Development Center Vandenberg AFB, California, 21 June 1957 – 1 January 1958 1st Strategic Aerospace Division Hickam AFB, Hawaii 6594th Test Group - satellite photo recovery Hanscom AFB, Massachusetts, 1 August 1951 – 1 July 1992 USAF Cambridge Research Center USAF Command and Control Development Division USAF Geophysics Laboratory Electronic Systems Division USAF Computer Acquisition Center Holloman AFB, New Mexico, 2 April 1951 – 1 January 1971 USAF Missile Development Center Kirtland AFB, New Mexico, 1 April 1952 – 1 July 1977 USAF Special Weapons Center USAF Research Laboratory 4900th Air Base Wing 4925th Test Group Patrick AFB, Florida, 14 May 1951 –