The fourth unit of Wing 9 was formed at Air Force Base in the United Kingdom in March 1979. The unit had four reconnaissance officers, two SR-71s and two U-2Rs, the first commander being Colonel Mari, the last one being Colonel Hence. Force consisted of ten officers, 80 NCO and 50-80 civilians. Latter were subsequently replaced by only 14 Lockheed engineers and technicians. Although the “unit 4” remained part of the SAC, it was operationally subordinate to the command of the 3rd Air Force, which represented the U.S. Air Force in Western Europe. Flights in the airspace of Western Europe and near the western borders of the USSR were called “Senior Ruby”. The first SR landed in Britain on April 20, 1979, while British Prime Minister Margaret Thatcher officially announced the presence in on a permanent basis of the U.S. Air Force's strategic intelligence unit only on April 5, 1984, and the first press reports appeared in 1982. At different times, was based on at least nine vehicles (simu
