Helicopter Sikorsky HO5S-1 Serial 52-029 Register 126704 used by US Marine Corps USMC. Built 1952. Aircraft history and location Aircraft History 126704 US Marine Corps 1952-06-27Sikorsky S-52-3, c/n 52-029, ff:? acc BuAerRep (BAR) East Hartford, CT, 27Jun52 del USMC as HO5S-1, 126704, 03Jul52. 1956-08-29soc 29aug56 Send Updates Use APP to upload photo @ (optional) When Now? / / Send