List of Operators of XHR2S-1 Years Model Org 1956/70 S-56 H-37 US Marine Corps Global Distribution of XHR2S-1 5xhr2s-1 Construction Numbers C/N Year History 56-1X 1953 56-2X 1953 133732 56-3X 1954 133733 56-4X 1955 133734 56-5X 1954 133735