Helicopter Sikorsky HRS-3 Serial 55-432 Register 137836 used by US Marine Corps USMC. Built 1953. Aircraft history and location Aircraft History 137836 US Marine Corps 1953-05-13Sikorsky S-55 c/n 55-432, ff:? del USMC as HRS-3, 137836, 13May53. Send Updates Use APP to upload photo @ (optional) When Now? / / Send