NASA is taking the unprecedented step of shortening a mission aboard the International Space Station due to a medical situation involving an astronaut. The U.S.-Japanese-Russian crew of four will return to Earth sooner than originally planned. The agency canceled a scheduled spacewalk to address the astronaut’s health, though the individual’s identity and condition remain confidential. According to Dr. James Polk, NASA’s chief health officer, this marks the first medical evacuation from the station, despite prior onboard treatments for minor issues. The crew, who arrived via SpaceX in August, included NASA astronauts Zena Cardman and Mike Fincke, Japan’s Kimiya Yui, and Russia’s Oleg Platonov. NASA emphasizes the return is precautionary and is committed to crew safety. Meanwhile, other astronauts continue their mission aboard the station, with SpaceX slated to assist in retiring the station safely by 2030 or 2031.