Helicopter Sikorsky CH-53D Sea Stallion Serial 65-173 Register 156669 used by US Marine Corps USMC. Aircraft history and location Aircraft History 156669 US Marine Corps Sikorsky S-65C, c/n 65-173, ff:? del USMC as CH-53D 156669, unk Send Updates Use APP to upload photo @ (optional) When Now? / / Send