The astronaut is stepping away from NASA shortly after returning from a troubled test flight that left him aboard the ISS months longer than expected.

Veteran NASA astronaut Butch Wilmore has retired after 25 years of service, after completing the troubled Boeing Starliner mission. Wilmore, who flew on four different spacecraft and logged 464 days in space,

One of NASA's two previously stuck astronauts has retired. NASA announced Butch Wilmore's departure from the space agency on Wednesday.