Cycling for a purpose
Staff Sgt. Terrance Raybon, 2nd Support Squadron, grabs a glove before collecting an airman's blood at the clinic on Barkdale Air Force Base, La., Jun 15. Blood tests are used to determine physiological and biochemical states, such as disease, mineral content, drug effectiveness and organ function. (U.S. Air Force photo/Senior Airman Kristin High)(RELEASED)