Helicopter Sikorsky HRS-2 Serial 55-101 Register 129019 used by US Marine Corps USMC. Built 1952. Aircraft history and location Aircraft History 129019 US Marine Corps 1952-01-17Sikorsky S-55 c/n 55-101, ff:? del USMC as HRS-2, 129019, 17Jan52 1954-09-13 Sikorsky HRS-3 13sep54 Send Updates Use APP to upload photo @ (optional) When Now? / / Send