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The 4477th Test and Evaluation Squadron (4477 TES) was a squadron in the United States Air Force under the claimancy of the Tactical Air Command (TAC). It is currently inactive. The product of Project Constant Peg, the unit was created to expose the tactical air forces to the flight characteristics of fighter aircraft used by Soviet Union during the Cold War. The declassified history of the squadron shows that it operated MiG-17s, MiG-21s and MiG-23s between 1977 and 1988, but it was not formally disbanded until July 1990.
By the late 1970s, United States MiG operations were undergoing another change. In the late 1960s, the MiG-17 and MiG-21F were still frontline aircraft. A decade later, they had been superseded by later-model MiG-21s and new aircraft, such as the MiG-23. Fortunately, a new source of supply of Soviet aircraft became available, Egypt. In the mid-1970s, relations between Egypt and the Soviet Union had become strained, and Soviet advisers were ordered out. The Soviets had provided the Egyptian air force with MiGs since the mid-1950s. Now, with their traditional source out of the picture, the Egyptians began looking west. They turned to United States companies for parts to support their late-model MiG-21s and MiG-23s. Very soon, a deal was made. According to one account, two MiG-23 fighter bombers were given to the United States by Egyptian president Anwar Sadat. The planes were disassembled and shipped from Egypt to Edwards Air Force Base. They were then transferred initially to Groom Lake for reassembly and study.