Capt. Sarah Freidel, 34th Bomb Squadron flight surgeon, listens to the heart of Staff Sgt. Jacob Appleby, 28th Medical Operations Squadron ambulance services technician, during a physical exam in the flight medicine clinic on Ellsworth Air Force Base, S.D., May 2, 2012. (U.S. Air Force photo by Airman 1st Class Kate Thornton/Released)