manuals for the aircraft, although some tried to write one. Nor was there a consistent supply of spare parts, which had to be refurbished or manufactured at high cost. What was learned during these projects prompted the US Navy to commence Top Gun exercises first at NAS Miramar, California and then NAS Fallon, Nevada. Shortly thereafter the Air Force commenced its Red Flag exercises at Nellis AFB, Nevada. Near the end of the Cold War the program was abandoned and the squadron was disbanded. Flight operations closed down in March 1988, although the 4477th was not inactivated until July 1990, according to one official Air Force history. The decision to shut down operations may have had something to do with the fact that a new generation of Soviet aircraft was entering service and also the inevitable round of budget cuts from Washington. The assets of the squadron could not go to the boneyard at Davis-Monthan AFB, and the fate of them remains, in some cases, still classified. Several of the F-110s (MiG-21) were sent to museums or now are on static display. Some of the airplanes may have been broken up, and it is rumored that some were buried in the Nevada desert. In addition, a few were used for target practice on Air Force weapons ranges. In 2006, the Constant Peg program was declassified and the USAF held a series of press conferences about the former top secret US MiGs. It was revealed that the US MiGs flew more than 15,000 sorties and nearly 7,000 aircrew flew in training against dissimilar aggressors in the Nevada desert between 1980 and the end of the program in 1988. Detachment 3, 53d Test and Evaluation Group After the 4477th TES was inactivated, the remaining assets were reconstituted as a detachment of the 57th Fighter Wing at Nellis AFB. It later became DET 2, 57th Fighter Wing in October 1991 and DET 2, 57th Wing in April 1993; in October 1996, DET 2, 57th Wing, became Detachment 3 of the 53rd Test and Evaluation Group. It is believed that Air Force Materiel Command operates MiG-29 Fulcrums and Su-27 Flanker aircraft somewhere in Nevada flying against Fighter Weapons School instructors, 422d Test and Evaluation Squadron aircrews and F-15 Eagle and F-16 Fighting Falcon "Aggressor" aircraft flying from Nellis AFB. It is known that the USAF continues a Foreign Materiel Acquisition/Exploitation program, although the extent