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NASA astronaut Kjell Lindgren participates in training at SpaceX headquarters in Hawthorne, CA.

NASA astronauts Bob Hines and Kjell Lindgren participate in a training session at SpaceX headquarters in Hawthorne, CA.

NASA astronauts Bob Hines and Kjell Lindgren participate in a training session at SpaceX headquarters in Hawthorne, CA.

NASA astronaut Bob Hines participates in training at SpaceX headquarters in Hawthorne, CA.

NASA astronauts Bob Hines and Kjell Lindgren participate in a training session at SpaceX headquarters in Hawthorne, CA.

NASA astronauts Bob Hines and Kjell Lindgren participate in a training session at SpaceX headquarters in Hawthorne, CA.

NASA astronauts Bob Hines and Kjell Lindgren participate in a training session at SpaceX headquarters in Hawthorne, CA.

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