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Former NASA astronaut and US Senator, John Glenn, signs the official transfer document as the official witness, transferring possession of Space Shuttle Discovery to the Smithsonian during the Welcome Discovery Ceremony at the Smithsonian's Udvar-Hazy National Air and Space Museum's annex on April 19, 2012.   Mike Lynaugh

Former NASA astronaut and US Senator, John Glenn, signs the official transfer document as the official witness, transferring possession of Space Shuttle Discovery to the Smithsonian during the Welcome Discovery Ceremony at the Smithsonian's Udvar-Hazy National Air and Space Museum's annex on April 19, 2012.

Mike Lynaugh