Helicopter Sikorsky HRS-1 Serial 55-059 Register N6872C 127823 used by US Marine Corps USMC. Built 1951. Aircraft history and location Aircraft History 127823 US Marine Corps 1951-09-05Sikorsky S-55 c/n 55-059, ff:? del USMC as HRS-1, 127823, 05Sep51 N6872C - 1967-09-09 ex 127823 w/o 09sep67 Send Updates Use APP to upload photo @ (optional) When Now? / / Send