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. DM
This article is more than 7 years old
World
For first time in decades, astronaut quits NASA training
For the first time in five decades, a NASA astronaut candidate has resigned from training, the US space agency said Tuesday.
