Share this article Share this article WASHINGTON, June 2, 2021 /PRNewswire/ -- NASA astronaut and former U.S. Navy Capt. Chris Cassidy has retired from the agency's astronaut corps after 17 years of service. His last day at NASA was Friday, May 28. In his career, Cassidy accumulated 378 days in space. Of that time, he spent 54 hours, 51 minutes outside of the International Space Station over the course of 10 spacewalks. "It's been an amazing run," Cassidy said in a video posted to his Instagram account. "I've had so many wonderful opportunities, both on the ground, in the air, and in space and underwater. I'm so privileged and feel so lucky that I've got to work with the folks that I have, had the mentors that I've had, the friendships I've developed all around the world, and I just want to say thank you."