Helicopter Sikorsky HRS-1 Serial 55-037 Register 127802 used by US Marine Corps USMC. Built 1951. Aircraft history and location Aircraft History 127802 US Marine Corps 1951-07-03Sikorsky S-55 c/n 55-037, ff:? del USMC as HRS-1, 127802, 03Jul51 1951-09-28 w/o 28sep51 in Korea Send Updates Use APP to upload photo @ (optional) When Now? / / Send