Helicopter Sikorsky HRS-1 Serial 55-049 Register 127813 used by US Marine Corps USMC. Built 1951. Aircraft history and location Aircraft History 127813 US Marine Corps 1951-08-16Sikorsky S-55 c/n 55-049, ff:? del USMC as HRS-1, 127813, 16Aug51 1955-05-23 w/o 23may55 USS Mindoro (CVE-120) Send Updates Use APP to upload photo @ (optional) When Now? / / Send