In this May 1961 file photo, Mercury 7 astronauts Alan Shepard, John Glenn and Virgil "Gus" Grissom pose for a photo. Fellow Mercury 7 astronaut Scott Carpenter's death on Oct. 10, 2013 leaves John ... more 
In this May 1961 file photo, Mercury 7 astronauts Alan Shepard, John Glenn and Virgil "Gus" Grissom pose for a photo. Fellow Mercury 7 astronaut Scott Carpenter's death on Oct. 10, 2013 leaves John Glenn as the sole living member of the famed group.(AP Photo, File) less 
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Associated Press
Thu, Oct 10, 2013 11:03 PM EDT