Helicopter Sikorsky CH-53D Sea Stallion Serial 65-170 Register 156666 used by US Marine Corps USMC. Aircraft history and location Aircraft History 156666 US Marine Corps Sikorsky S-65C, c/n 65-170, ff:? del USMC as CH-53D 156666, unk Send Updates Use APP to upload photo @ (optional) When Now? / / Send