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,

Astronaut and University of Tennessee graduate Barry "Butch" Wilmore has announced his retirement from NASA. The news comes months after he and fellow Astronaut Suni Williams returned to Earth from a nine-month stay aboard the International Space Station that made world news.

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.