Helicopter Sikorsky HO5S-1 Serial 52-011 Register 125518 used by US Marine Corps USMC. Built 1952. Aircraft history and location Aircraft History 125518 US Marine Corps 1952-03-20Sikorsky S-52-3, c/n 52-011, ff:? acc BuAerRep (BAR) East Hartford, CT, 20Mar52 del USMC as HO5S-1, 125518, 22Mar52. Send Updates Use APP to upload photo @ (optional) When Now? / / Send