The NASA Space Shuttle Discovery sits on a road prior to a welcoming ceremony at the Smithsonian's National Air and Space Museum annex in Chantilly, Va., on April 19, 2012. (Rod Lamkey Jr./The Washington Times)

Photo by: ROD LAMKEY JR

The NASA Space Shuttle Discovery sits on a road prior to a welcoming ceremony at the Smithsonian's National Air and Space Museum annex in Chantilly, Va., on April 19, 2012. (Rod Lamkey Jr./The Washington Times)