Atlantis Boeing B-52 With X-15 175th Scale Model KitDetails: Model kit comes molded in Shiny silver plastic and clear with swivel base plus another display stand to hold the X 15 if desired, updated decals, in scale X 15 and an option to add external fuel tanks. Decals for USAF and Nasa. One of the major steps in America's program to conquer space was the X 15 Project. The stated aims of the project were to discover how well an aircraft can be controlled in near space environment, and what problems are