Senior Airman Lance Gillenwater, 28th Medical Support Squadron medical laboratory technician, examines a blood processed through a centrifuge in the clinical laboratory at Ellsworth Air Force Base, S.D., April 19, 2013. Medical laboratory technicians, conduct procedures to identify bacteria and determine antibiotic sensitivity of pathogenic microorganisms. (U.S. Air Force photo by Airman 1st Class Zachary Hada/Released)