Helicopter Sikorsky HR2S-1 Serial 56-029 Register 140325 used by US Marine Corps USMC. Built 1957. Aircraft history and location Aircraft History 140325 US Marine Corps 1957-05-03Sikorsky S-56, c/n 56-029, ff:? del USMC as HR2S-1, 140325, 03May57 wfu & soc unk. 1959-10-14 w/o 14oct59 Send Updates Use APP to upload photo @ (optional) When Now? / / Send