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Reliving historic moments at the Gagarin Cosmonaut Training Center in Star City, Russia, former Russian cosmonaut Alexey Leonov (top row, 2nd from the left) and former NASA astronaut Thomas Stafford (top row, 3rd from the left) join other members of the Stafford-Utkin Advisory Commission visiting Russia during a celebration of the 40th anniversary of the Apollo-Soyuz mission that opened a new era of space cooperation between the U.S. and Russia. Stafford commanded the Apollo spacecraft and Leonov commanded the Soyuz 19 spacecraft that docked on July 17, 1975 in the first-ever linkup of American and Russian space vehicles. At the lower left is cosmonaut Yuri Lonchakov, the Director of the Gagarin Cosmonaut Training Center.