Helicopter Sikorsky HO5S-1 Serial 52-026 Register 126701 used by US Marine Corps USMC. Built 1952. Aircraft history and location Aircraft History 126701 US Marine Corps 1952-06-27Sikorsky S-52-3, c/n 52-026, ff:? acc BuAerRep (BAR) East Hartford, CT, 27Jun52 del USMC as HO5S-1, 126701, 03Jul52. 1956-07-18soc 18jul56 Send Updates Use APP to upload photo @ (optional) When Now? / / Send