The 1950s saw Czechoslovakia join the Warsaw Pact in May 1955 and massive build-up of its military. Numerous new air force units were formed, new air bases built, and naturally a number of new pilots trained under the supervision of Soviet advisors. As new units were formed, new equipment was purchased extensively. in the 1950s large numbers of modern MiG-15, MiG-17, and MiG-19 fighters and IL-28 bombers were purchased, while in the 1960s units received Mach-2 MiG-21 fighters and Su-7 fighters-bombers.
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