Helicopter Sikorsky HRS-2 Serial 55-133 Register 129037 used by US Marine Corps USMC. Built 1952. Aircraft history and location Aircraft History 129037 US Marine Corps 1952-05-05Sikorsky S-55 c/n 55-133, ff:? del USMC as HRS-2, 129037, 05May52 w/o 05dec52 Send Updates Use APP to upload photo @ (optional) When Now? / / Send