Jet Take-off At Nevada testing ground. The U.S. Air Force shows a new rocket launching technique. Taking off from a truck-borne platform (but the truck is standing still) the rocket hurtles a super-sabre jet aloft from a standing start, reaching 300 M.P.H. in 4 seconds. Cockpit hatch closes. Jet is raised so that it's at a tilt. Part of platform underneath landing gear says "world's shortest runway". Jet takes off; the rocket (?) that was used to power its takeoff falls away. Plane does a barrel roll.