 In January 1965 the 18th Fighter Regiment received a squadron of 12 MiG-21PFs, some of which also were converted and used as a reconnaissance aircraft (MiG-oboznachevnieto 21PFR).The 26 Regiment reconnaissance aircraft from this squadron were removed from service in 1991, the 15 Fighter Regiment in 1965 received another 12 MiG-21PF fighters and in 1977–1978 operated another 36 refurbished aircraft.This unit received two more aircraft in 1984 and operated them until 1992.