Mauritanian Air Force Chief of Staff Col. Mohamed Lehreitani greets U.S. 17th Expeditionary Air Force Commander Lt. Gen. Timothy Ray as he arrives at the Palais des Congres for the opening ceremony of the 5th Annual African Air Chiefs Symposium in Nouakchott, Mauritania, Sept. 15, 2015. The Mauritanian Air Force is co-hosting this year’s African Air Chiefs Symposium along-side U.S. Air Forces Africa Sept. 14-17. The event gives Air Chiefs from the U.S. and 18 African countries the chance to discuss the role of Air Power in addressing African challenges. (U.S. Air Force photo by Master Sgt. Chrissy Best/Released)