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This June 6, 2017 photo shows NASA astronaut candidate Robb Kulin at Ellington Field in Houston. Kulin has resigned halfway through his two years of training at Johnson Space Center in Houston. A NASA spokeswoman says his departure is effective Friday, Aug. 31, 2018, and that he is leaving for personal reasons that the space agency cannot discuss due to privacy laws. (Robert Markowitz/NASA via AP)

This June 6, 2017 photo shows NASA astronaut candidate Robb Kulin at Ellington Field in Houston. Kulin has resigned halfway through his two years of training at Johnson Space Center in Houston. A NASA spokeswoman says his departure is effective Friday, Aug. 31, 2018, and that he is leaving for personal reasons that the space agency cannot discuss due to privacy laws. (Robert Markowitz/NASA via AP)

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