USMC utility transport helicopter developed in 1953. The original designation was HR2S-1 but this was changed to CH-37C in the redesignation of all US armed forces helicopters in 1962.
The assault transport helicopter could carry up to either 36 passengers, three jeeps or a single 105 mm antitank gun. Sikorsky was experimenting with blades widths; the wider chord upgrade was used for this entry.
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