Helicopter Sikorsky CH-53D Sea Stallion Serial 65-217 Register 156970 used by US Marine Corps USMC. Aircraft history and location Aircraft History 156970 US Marine Corps Sikorsky S-65C, c/n 65-217, ff:? del USMC as CH-53D 156970, unk 1985-07-12 A ROTMw/o 12 HMH-361 /YN-651 crashed into mountain on Okinawa. Four fatalities HMH-361 RIP Captain Neil Lippy, Captain Charles Alsworth, Sergeant Walker and Corporal Tyler Send Updates Use APP to upload photo @ (optional) When Now? / / Send