Helicopter Sikorsky HR2S-1 Serial 56-027 Register 140324 used by US Marine Corps USMC. Built 1957. Aircraft history and location Aircraft History 140324 US Marine Corps 1957-06-12Sikorsky S-56, c/n 56-027, ff:? del USMC as HR2S-1, 140324, 12Jun57 wfu & soc unk. 1959-03-10w/o 10mar59 Send Updates Use APP to upload photo @ (optional) When Now? / / Send