Helicopter Sikorsky HRS-2 Serial 55-090 Register 129018 used by US Marine Corps USMC. Built 1952. Aircraft history and location Aircraft History 129018 US Marine Corps 1952-01-19Sikorsky S-55 c/n 55-090, ff:? del USMC as HRS-2, 129018, 19Jan52 1952-07-31 31jul52 ditched, Korea Sikorsky HRS-3 5apr55 Send Updates Use APP to upload photo @ (optional) When Now? / / Send