By words test participants, one of the main tasks that was set before the American pilots was to find out all the subtleties and basic vulnerabilities of Soviet fighters. This was necessary for the US military to gain an advantage over Soviet aircraft in the air.
Note that according to the same pilots, the project for testing Soviet combat vehicles was closed in 1988. But very soon after that, the military reopened a similar program, within the framework of which other fighters were tested, including the MiG-29 and Su-27.
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