tankers rotated to Shemya where they were re-fueled prior to taking off and refueling the loitering B-52s over Alaska which would loiter outside the Soviet Union to provide rapid first strike or retaliation capability in case of nuclear war. Shemya also supported various SAC Boeing RC-135 "Rivet" reconnaissance aircraft flying along the Soviet Pacific Coast with on-board sensors which enable the crew to detect, identify and geolocate signals throughout the electromagnetic spectrum. The base host squadron was re-designated the 5073rd Air Base Squadron in October 1962, and upgraded to a group on 15 October 1974 in recognition of the number and complexities of the tenant units it supported. Shemya was re-designated from an Air Force Station to an Air Force Base on 21 June 1968. In 1966 the Air Defense Command 9th Air Division assumed jurisdiction of the base. ADC organized the 16th Surveillance Squadron with AN/FPS-17 Detection and AN/FPS-80 Tracking Radars to monitor Soviet missile tests on the Kamchatka Peninsula and to support the Air Force Spacetrack System. Soviet fishing trawlers were a common sight in the offshore waters of the island, monitoring the squadron's activities. In July 1973, Raytheon won a contract to build a system called COBRA DANE on Shemya. Cobra Dane replaced the AN/FPS-17 and AN/FPS-80 radars with a more powerful AN/FPS-108 phased-array radar. Cobra Dane was declared operational on 1 August 1977. Its primary mission is intelligence gathering in support of verification of the SALT II arms limitation agreement. The station was also used by SAC Cobra Ball and other related projects which monitored missile-associated signals and tracks missiles during boost and re-entry phases to provide reconnaissance for treaty verification and theater ballistic missile proliferation. The aircraft used were extensively modified C-135Bs. In August 1988, at least one Aries rocket was launched, relating to the Queen Match program, for anti-ballistic missile testing. Jurisdiction of Shemya AFB was transferred from the Aerospace Defense Command to the Strategic Air Command when the former was inactivated on 1 October 1979. It was transferred to the Air Force Space Command on 1 May 1983. During the 1980s the facilities on Shemya were upgraded. Many of the old World War II structures were replaced with modern buildings and new facilities were built. From 1992 On 27 January 1992 the 5073rd Air Base Group located at Shemya AFB was re-designated as the 673d Air Base Group (673 ABG), subordinate to the