Stock Photo - NASA astronaut Chris Ferguson, STS-135 commander, listens as a crewmate addresses the crowd during a July 22 welcome home ceremony for the crew of the space shuttle Atlantis at Ellington Field in Houston. STS-135 is the final mission of the NASA Space Shuttle Program.

Stock Photo: NASA astronaut Chris Ferguson, STS-135 commander, listens as a crewmate addresses the crowd during a July 22 welcome home ceremony for the crew of the space.

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