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Constant Peg
For years, rumors persisted that Soviet-bloc warplanes were being secretly tested by the US. In March 1998, three decades after American pilots flew the MiG-21 in US skies, the USAF allowed details – and some pictures – to become public. By then, numerous accounts had appeared in the press.
After decades of secrecy, the Air Force acknowledged 23 November 2006 that it flew Communist-built fighters at the Tonopah Test Range northwest of Las Vegas. From 1977 through 1988, the program, known as Constant Peg, saw US Air Force, Navy, and Marine aircrews flying against Soviet-designed MiG fighters as part of a training program where American pilots could better learn how to defeat or evade the communist bloc's fighters of the day.
As a result of marginal performance of American fighter forces in the skies over North Vietnam, Constant Peg complemented other revolutionary training programs such as Red Flag, Top Gun and the Air Force and Navy-Marine aggressor squadrons. The program also was intended to eliminate the "buck fever" or nervous excitement many pilots experience on their first few combat missions. Historical experience indicated that pilots who survived their first 10 missions were much more likely to survive a complete combat tour, and Constant Peg was intended to teach them the right "moves" to enable them to come out on top of any engagement.
The Groom Lake program, instituted in the mid-1970s was highly successful and used a series of code names prefixed by Have-. The word `Have’ in project names such as HAVE DOUGHNUT (MiG-21) or HAVE BLUE (the prototype for the F-117 stealth fighter) simply mark the project as belonging to AFSC. The aircraft bore US designations prefixed by YF- with numbers ranging from around 110 to 118 with letter suffixes. For example, YF-114C may have been a MiG-17F used in the Have Ferry program.
>https://www.globalsecurity.org/military/systems/aircraft/constant-peg.htm