Helicopter Sikorsky HRS-1 Serial 55-044 Register 127808 used by US Navy USN ,US Marine Corps USMC. Built 1951. Aircraft history and location Aircraft History 127808 US Marine Corps 1951-07-16Sikorsky S-55 c/n 55-044, ff:? del USMC as HRS-1, 127808, 16Jul51 US Navy 1953-10-28w/o 28oct53 Send Updates Use APP to upload photo @ (optional) When Now? / / Send