U.S. Navy Commander Ryan Maves, physician of infectious diseases, teaches medical professionals about illnesses during the Military Tropical Medicine seminar May 11, 2016 at Camp Lemonnier, Djibouti. Medical specialists from the U.S., France, Germany, Italy and Djibouti attended the seminar to learn about treating tropical illnesses and diseases and how they affect military personnel in a contingency environment. (U.S. Air Force photo by Senior Airman Benjamin Raughton/Released)