$50,000,000 shall be made available only for single-stage-to-orbit ("SSTO") research and development in PE 63401F at Phillips Laboratory, Albuquerque, New Mexico, for use for Air Force activities in direct support of the National Aeronautics and Space Administration-led "X-33" SSTO Advanced Technology Demonstrator ("ATD") X-vehicle program, pursuant to recommendations of the "Moorman Space Launch Modernization Plan" as well as to the President's space launch policy (PDD/NSTC-4). v. 1 Friday 31 March 1995