of the ballistic missile warning system (BMEWS) and all Space Surveillance Network facilities from the inactivating Aerospace Defense Command (ADC). These activities would later be (transferred to Air Force Space Command (AFSPC) when the latter was established in 1982. SAC also continued to operate the Air Force's entire KC-135 aerial refueling fleet, its EC-135 LOOKING GLASS and E-4 NEACAP command post aircraft, as well the entire strategic reconnaissance aircraft fleet consisting of the U-2, SR-71, RC-135, and WC-135. In 1981, SAC received a new air refueling tanker aircraft to supplement the aging KC-135 Stratotanker force. Based on the McDonnell Douglas DC-10 commercial airliner, the KC-10A Extender was deployed equipped with improved military avionics, aerial refueling, and satellite communications equipment. That same year, President Ronald Reagan reversed the 1977 Carter administration decision regarding the B-1, directing that 100 examples of a refined version of the aircraft, now designated the B-1B Lancer, be procured as a long-range combat aircraft for SAC. The LGM-118A Peacekeeper ICBM reached SAC in 1986, and the 114 Peacekeepers had a total warhead yield of about 342 megatons. This also served to offset the retirement of the obsolescent and maintenance-intensive LGM-25C Titan II ICBM, the last example of which was deactivated in May 1987. An additional underground "16,000 square-foot, two-story reinforced concrete" command post for HQ SAC was also constructed at Offutt AFB from 1986 to 1989 from a design by Leo A. Daly, who had designed the adjoining 1957 bunker. The first Rockwell B-1B Lancer was also delivered to SAC in 1987. On 22 November 1988, the Northrop Grumman B-2 Spirit, under development as the Advanced Technology Bomber (ATB), a so-called "black program" since 1979, was officially acknowledged and rolled out for the first time for public display. The first "stealth bomber" designed for SAC, the aircraft made its first flight in May 1989. End of the Cold War and Operation Desert Storm SAC reorganization at the end of the Cold War began as early as 1988 when the Carlucci Commission planned the closure of: Mather Air Force Base, California, an ATC undergraduate navigator training (UNT) base which hosted a tenant SAC B-52G / KC-135E bomb wing and a SAC-gained AFRES KC-135A air refueling group; and Pease Air Force Base, New Hampshire, a SAC base with an FB-111A and KC-135E bomb wing and a SAC-gained ANG KC-135A air refueling wing The closures were the beginning of a