HURLBURT FIELD, Fla. --   Junior Reserve Officers' Training Corps cadet Derrick Drennen performs a burpee during physical training at Hurlburt Field, Fla., July 20, 2016. From July 18-22, more than 60 Junior ROTC cadets from nearby high schools visited base for their Summer Leadership School - a course designed to teach cadets leadership, confidence and other traits. (U.S. Air Force photo by Airman 1st Class Joseph Pick)