Defence (Управление командующего войсками противоракетной и противокосмической (УКВ ПРО и ПКО)), under Lieutenant-General of Artillery Yuri Votintsev, was formed within the Air Defence Forces. In February 1971 the 1st Division for Warning Against Missile Attack (1st Division WAMA, 1-я Дивизия предупреждения о ракетном нападении (1-я дПРН)) was formed with HQ in Solnechnegorsk, the 57th Separate Radiotechnical Nod in Olenegorsk, Murmansk Oblast and the 129th Separate Radiotechnical Nod in Skrunda, Latvian SSR. Organisationally, there were two main PVO districts for most of the USSR's postwar history, the Moscow Air Defence District (formed 1950) and Baku (formed 1954). The rest of the country was initially divided into PVO regions covering Belarus, the Ukraine, the Baltics and Central Asia. However, in 1960 it appears that most of the PVO regions/areas were reorganised into seven separate armies of the Air Defence Forces – the 2nd, 4th, 6th, 8th, 10th, 11th, 14th, and 19th Air Defence Army. In 1963 the 30th independent Air Defence Corps in Tashkent became the 12th Independent Air Defence Army. In 1977, the Air Forces and Air Defence Forces were re-organised in the Baltic states and the Leningrad Oblast (a trial run for the larger re-organisation in 1980 covering the whole country). All fighter units in the PVO were transferred to the VVS, the PVO only retaining the anti-aircraft missile units and radar units – the 6th Independent Air Defence Army was disbanded, and the 15th Air Army became the Air Forces of the Baltic Military District. By 1981, the now Voyska PVO had been stripped of many command and control and training assets, which were moved to the Air Force. During the 1980s, the PVO interceptor units were re-equipped with the Mikoyan MiG-31 and Sukhoi Su-27P, while missile units received new electronic countermeasures systems and the S-300 surface-to-air missile system. The modernization of the PVO prioritized units in the High North and the Far East due to the threat from American spyplane missions and United States Pacific Fleet carrier aircraft. Shelton lists a total of 140 officer commissioning schools, drawn from a Krasnaya Zvezda list of 17 January 1980. That total included 15 Air Defence Forces schools (four Fighter Aviation, five radio-electronics, and six Anti-Aircraft Rocket). On 1 September 1983 the PVO shot down Korean Air Flight 007 after the civilian airliner had crossed into restricted Soviet airspace and was mistaken for a spy plane. Previously Korean Air Flight 902