Astronaut Neil A. Armstrong, wearing an Extravehicular Mobility Unit, participates in a simulation of deploying and using lunar tools on the surface of the Moon during a training exercise in Building 9 at the NASA Manned Spacecraft Center (now Johnson Space Center) in Houston, Texas, on April 22, 1969. In the background is the Lunar Module mock-up used for crew training. Three months after this photo was taken Armstrong would be on his way back from the Moon - having been the first human to set foot on the Moon during the Apollo 11 mission in July 1969.
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