HOUSTON – After more than two decades of service with NASA and four spaceflights, including the troubled Boeing Starliner mission, astronaut Barry "Butch" Wilmore has decided to retire, the space agency announced.

During Wilmore’s 25-year-long career, the veteran astronaut conducted five spacewalks and spent more than 460 days in space during missions involving the Space Shuttle Atlantis, the Russian Soyuz, SpaceX’s Crew Dragon and most recently, Boeing’s Starliner .

"Butch’s commitment to NASA’s mission and dedication to human space exploration is truly exemplary," Steve Koerner, acting director of NASA’s Johnson Space Center in Houston, said in a statement . "His lasting legacy of fortitude will continue to impact and inspire the Johnson workforce, future explorers, and the nation for

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