釜山橋頭堡の戦い
HMX-1, the first Marine helicopter squadron, was commissioned on 1 December 1947. Marine helicopters—VMO-6 flying the HO3S1 helicopter—made their combat debut in August 1950 during the Battle of Pusan Perimeter. January 1951 saw the activation of HMR-161, the world's first helicopter transport squadron.