Helicopters used by Polish Army were: SM-1 (under licence of Mil Mi-1) - multirole (since 1956), Mil Mi-4 - multirole (since 1958), SM-2 - multirole (since 1960), Mil Mi-2 and Mil Mi-8 (later also Mil Mi-17) (since 1968) - multirole and Mil Mi-24 (since 1976) - combat helicopter.
In 1954, the Air Force was merged with Air Defence Force, creating Air and Country Air Defence Forces (Wojska Lotnicze i Obrony Przeciwlotniczej Obszaru Kraju - WLiOPL OK).