NASA astronaut Mike Fincke is pictured inside the International Space Station’s Quest airlock prior to the start of the third spacewalk for the STS-134 mission. Credit: NASANASA astronaut Mike Fincke is departing the agency on Wednesday after 30 years of service. Throughout his career, he flew four missions, spent 549 days in space, and completed nine spacewalks in support of the International Space Station. “Few people have had the opportunity to shape as many chapters of NASA’s history as Mike Fincke,” said NASA Administrator Jared Isaacman. Early in the International Space Station Program, he helped test and integrate several of the station’s initial modules before launch.