NASA astronaut Chris Williams calls down to mission controllers during Crew Medical Officer training

iss074e0316047 (Feb. 18, 2026) --- NASA astronaut and Expedition 74 Flight Engineer Chris Williams calls down to mission controllers during Crew Medical Officer training inside the International Space Station’s Destiny laboratory module. Williams trained to use medical hardware, including an automated external defibrillator, and reviewed procedures such as conducting eye exams and administering medicine. Credit: NASA/Jessica Meir