U.S. Air Force Staff Sergeant Rosemary Gutierrez, 28th Healthcare Operations Squadron noncommissioned officer in charge of laboratory services, pipettes a blood sample at Ellsworth Air Force Base, S.D., Jan. 28, 2025. The 28th HOS medical laboratory conducts blood testing to ensure safety and compatibility for patients in need of blood transfusions or medications. (U.S. Air Force photo by Senior Airman Dylan Maher)