 After being unloaded and assembled they were given to North Vietnam's oldest fighter unit, the 921st Fighter Regiment (921st FR), which had been created on 3 February 1964 as a MiG-17 unit.Because the Vietnam People's Air Force's (VPAF) 923rd FR was newer and less experienced, they would continue to operate MiG-17s, while the arrival of the MiG-19s (J6 versions) from China in 1969 would create North Vietnam's only MiG-19 unit, the 925th FR.On 3 February 1972, North Vietnam commissioned their fourth and last fighter regiment created during the war with South Vietnam, the MiG-21PFM (Type 94) equipped 927th Fighter Regiment.