IOWA -- NASA astronaut and Iowa native Peggy Whitson has announced she is retiring.
Whitson has completed three long-duration missions to the International Space Station and set records each time. In 2002, she become NASA's first Space Station science officer, and in 2008 become the first female commander of the Space Station.
Last year, Whitson became the first woman to command the Space Station twice, claimed the title for most spacewalks as a woman, and set the record for the most time in space by a US astronaut with 665 days.
In a tweet on Friday, Whitson said being a NASA astronaut was her greatest honor.
It’s been the greatest honor to live out my lifelong dream of being a @NASA Astronaut. Thank you to the #NASAVillage and all who have supported me along the way. As I reminisce on my many treasured memories, it’s safe to say my journey at NASA has been out of this world! pic.twitter.com/F4Dzrud4yL
— Peggy Whitson (@AstroPeggy) June 15, 2018