Hiller H-23 Raven helicopter

           The Hiller H-23 Raven was a three-seat utility helicopter used by the US Army during the Korean War.

            The Hiller UH-12 was the first commercial helicopter to make a trans-continental flight across the United States.  It was adopted by the US Army with the designation H-23 and by the US Navy with the designation HTE-1.  More than 2,000 of all versions were built.

            A small number of US Army H-23 Ravens arrived in Korea in February 1951.  They were used for the rest of the war for medical evacuation and for battlefield observation and surveillance.