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.

Four months after NASA astronauts Butch Wilmore and Suni Williams returned from their eight-day turned nine-month mission in space, Butch has retired.

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.