In this photo provided by NASA, ormer astronaut and U.S. Senator John 

In this photo provided by NASA, ormer astronaut and U.S. Senator John Glenn holds his hand to his heart during the playing of the National Anthem at the transfer ceremony for space shuttle Discovery, Thursday, April 19, 2012, at the Smithsonian's Steven F. Udvar-Hazy Center in Chantilly, Va. Space shuttle Discovery will take the place of Enterprise at the center to commemorate past achievements in space and retire as an artifact representing the 30-year shuttle program. (AP Photo/NASA, Paul E. Alers) MANDATORY CREDIT
Associated Press
In this photo provided by NASA, ormer astronaut and U.S. Senator John Glenn holds his hand to his heart during the playing of the National Anthem at the transfer ceremony for space shuttle Discovery, Thursday, April 19, 2012, at the Smithsonian's Steven F. Udvar-Hazy Center in Chantilly, Va. Space shuttle Discovery will take the place of Enterprise at the center to commemorate past achievements in space and retire as an artifact representing the 30-year shuttle program. (AP Photo/NASA, Paul E. Alers) MANDATORY CREDIT
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