Helicopter Sikorsky HRS-2 Serial 55-146 Register 129039 used by US Marine Corps USMC. Built 1952. Aircraft history and location Aircraft History 129039 US Marine Corps 1952-05-06Sikorsky S-55 c/n 55-146, ff:? del USMC as HRS-2, 129039, 06May52 Sikorsky HRS-3 02may57 soc San Diego Send Updates Use APP to upload photo @ (optional) When Now? / / Send