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Utility transport version for the US Army. The aircraft was re-designated to CH-37A in 1962 as part of the overall rationalization of designations for US Armed Forces aircraft.
The aircraft included a manually folded main rotor and hydraulically folded tail rotor pylon.
Source: S-56/HR2S-1/H-37 Helicopter, Vinny Devine, Igor I. Sikorsky Archives, April 2013)
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