The second of three D-558-2 Skyrockets built by Douglas for the US Navy's supersonic research. This was the first Mach 2 buster aircraft with Scott Crossfield taking it to Mach 2.005 on November 20, 1953 during NACA (National Advisory Committee for Aeronautics - renamed NASA after 1958) testing. It was the Skyrocket's only Mach 2 flight.