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.

Wilmore and Williams stayed at the ISS for over nine months as NASA and Boeing attempted to investigate what went wrong in their spacecraft and whether Starliner would be safe to carry astronauts home.

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 286-day stint on the International Space Station that made world news.