Helicopter Sikorsky HRS-2 Serial 55-113 Register 129025 used by US Marine Corps USMC. Built 1952. Aircraft history and location Aircraft History 129025 US Marine Corps 1952-02-20Sikorsky S-55 c/n 55-113, ff:? del USMC as HRS-2, 129025, 20Feb52 1957-01-23soc 23jan57 Send Updates Use APP to upload photo @ (optional) When Now? / / Send