Helicopter Sikorsky HR2S-1 Serial 56-026 Register 140323 used by US Marine Corps USMC. Built 1957. Aircraft history and location Aircraft History 140323 US Marine Corps 1957-06-12Sikorsky S-56, c/n 56-026, ff:? del USMC as HR2S-1, 140323, 12Jun57 wfu & soc unk. 1961-09-03 w/o 03sep61 Send Updates Use APP to upload photo @ (optional) When Now? / / Send