Helicopter Sikorsky HR2S-1 Serial 56-086 Register 145857 used by US Marine Corps USMC. Built 1958. Aircraft history and location Aircraft History 145857 US Marine Corps 1958-05-28Sikorsky S-56, c/n 56-086, ff:? del USMC as HR2S-1, 145857, 28May58 wfu & soc unk. 1968-04-30soc 30apr68 Send Updates Use APP to upload photo @ (optional) When Now? / / Send