Wilmore, 62, had already retired from the Navy. Williams, 59, also a retired Navy captain, is still with NASA. She joined Second Lady Usha Vance at Johnson Space Center in Houston earlier this week, taking part in a summer reading challenge for schoolchildren.

Astronaut Butch Wilmore is retiring from NASA less than five months after he returned from a troubled test mission that left him aboard the International Space Station far longer than expected, the space agency announced Wednesday.