Helicopter Sikorsky HRS-2 Serial 55-129 Register 129033 used by US Marine Corps USMC. Built 1952. Aircraft history and location Aircraft History 129033 US Marine Corps 1952-04-04Sikorsky S-55 c/n 55-129, ff:? del USMC as HRS-2, 129033, 04Apr52 Sikorsky HRS-3 03mar54 1964-09 soc Sep64 Send Updates Use APP to upload photo @ (optional) When Now? / / Send