Senior Airman Lance Gillenwater, 28th Medical Support Squadron medical laboratory technician, transfers blood to a chemical analyzer in the clinical laboratory at Ellsworth Air Force Base, S.D., April 19, 2013. The specialized medical instrument examines blood samples for various biological elements such as cholesterol, electrolytes and calcium. (U.S. Air Force photo by Airman 1st Class Zachary Hada/Released)