 After Paul's retirement on 31 May 1971, The FRC became the Dryden Flight Research Center in 1976.During his nearly 12 years with NASA he was responsible for several major aeronautical research programs, including those involving the X-15, the supersonic XB-70, the fleet of wingless lifting bodies that contributed to development of the Space Shuttles, and the Lunar Landing Research Vehicle that paved the way for successful Moon landings by Project Apollo astronauts.Just before Christmas 1961 Paul Bikle gave a directive to Charles Richard to quickly and cheaply design and build what would become the template for the Rogallo wing used for a high percentage of modern hang gliders.