Helicopter Sikorsky HRS-1 Serial 55-050 Register 127814 used by US Marine Corps USMC. Built 1951. Aircraft history and location Aircraft History 127814 US Marine Corps 1951-08-16Sikorsky S-55 c/n 55-050, ff:? del USMC as HRS-1, 127814, 16Aug51 1958-04-09 soc 09apr58 GI Memphis Send Updates Use APP to upload photo @ (optional) When Now? / / Send