The Boeing Dyna-Soar was designed to be a 35.5-foot piloted vehicle, had a sharply swept delta 20.4-ft-span wing, and was shaped remarkably like the shuttles of today. Constructed of super alloys, with a graphite and zirconia composite nose cap, the X-20, after reentry, was designed to land on a dry lake bed using three retractable struts. Although the X-20 reached the mockup stage and $410 million was spent on its development, on December 10, 1963, the program was canceled by the government. Congress directed that X-20 funding be diverted to the Manned Orbiting Laboratory, which used McDonnell-built Gemini capsules.