CAPE CANAVERAL, Fla. - Workers walk alongside space shuttle Discovery as it is towed to the Vehicle Assembly Building VAB from Orbiter Processing Facility-1 at NASAs Kennedy Space Center in Florida. The aft view of Discovery reveals the tail cone that covers the three replica shuttle main engines. The work is part of the Space Shuttle Programs transition and retirement processing of shuttle Discovery, which is being prepared for display at Smithsonians National Air and Space Museum, Steven F. Udvar-Hazy Center in Chantilly, Va. Discovery will remain in high bay 4 of the VAB until its scheduled transport atop a NASA Shuttle Carrier Aircraft modified 747 jet to Dulles International Airport in Virginia on April 17. Discovery will then be transported to the Smithsonian on April 19.