and to work together to improve the training of SAC aircrews. Headquarters Second Air Force was inactivated on 1 January 1975, being replaced by Headquarters Eighth Air Force which was transferred to Barksdale after being located at Andersen AFB, Guam for five years in charge of SAC strategic operations for the Vietnam War. At Barksdale, the Eighth took over the operations and personnel of the inactivated Second Air Force. In 1978, the Eighth Air Force Museum was established at Barksdale with the arrival of a Boeing B-17 Flying Fortress of the type the "Mighty Eighth" flew during World War II. The museum has grown greatly over the years, and today its collection includes the Consolidated B-24 Liberator, Boeing B-29 Superfortress, Boeing B-47 Stratojet, Boeing B-52D and G Stratofortresses, British Avro Vulcan B.Mk2, General Dynamics FB-111A, Beechcraft C-45 Expeditor, Douglas C-47 Skytrain, Noorduyn UC-64A Norseman, Boeing KC-97 Stratofreighter, Boeing KC-135 Stratotanker, North American P-51D/F-51D Mustang, Republic F-84F Thunderstreak, Mikoyan-Gurevich MiG-21F, Lockheed T-33 Shooting Star and Lockheed SR-71 Blackbird. Barksdale's 32nd Air Refueling Squadron received the first operational McDonnell Douglas KC-10A Extender aerial tanker in November 1981. The 32nd ARS was reassigned to the 458th Operations Group on 1 June 1992 and to the 305th Operations Group on 1 July 1995. The 71st ARS was reassigned to the 458th Operations Group at McGuire AFB, New Jersey. Barksdale's last KC-135 was placed in the Eighth Air Force Museum after its final flight in March 1994 and the last KC-10 departed for McGuire AFB in October. In April 1982, and again in December 1990, the Space Shuttle Columbia made stops at Barksdale on its way back to Cape Canaveral. In the immediate aftermath of the Columbia disaster in February 2003, a hangar at Barksdale AFB, being the closest base to the accident site, was used to collect and catalogue the orbiter's debris before it was shipped to Kennedy Space Center, Florida. On 20 September 2009, the airport was again used as a refuelling stop for the Space Shuttle's return flight to Kennedy Space Center, as has done numerous times before. This time it was Discovery that was being piggybacked from Naval Air Station Joint Reserve Base Fort Worth. The Shuttle Carrier Aircraft and Discovery remained at Barksdale over night. Operation Just Cause/Desert Shield/Desert Storm Barksdale played significant roles in Operation Just Cause to restore democracy in Panama in December 1989, Operation Desert Shield in