Helicopter Sikorsky HR2S-1 Serial 56-087 Register 145858 used by US Marine Corps USMC. Built 1958. Aircraft history and location Aircraft History 145858 US Marine Corps 1958-06-02Sikorsky S-56, c/n 56-087, ff:? del USMC as HR2S-1, 145858, 02Jun58 wfu & soc unk. Send Updates Use APP to upload photo @ (optional) When Now? / / Send