Robb Kulin resigned from NASA effective August 31 for personal reasons, spokeswoman Brandi Dean said, declining to provide further details.
It's not an easy gig to get -- some 18,000 people routinely seek the 12 spots that open each year.
Kulin, who joined his class sounding upbeat, is the first would-be astronaut to leave training since a resignation in 1968.
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