Gen. Hawk Carlisle, the Air Combat Command commander, talks about the 5th generation warfare during the Air Force Association Air and Space Conference and Technology Exposition in Washington, D.C., Sept. 15, 2015. The AFA conference brought together Air Force leadership, industry experts, scholars and current aerospace specialists from around the world to discuss the issues and challenges facing the U.S. and the aerospace community today. (Air Force photo /Tech. Sgt. Dan DeCook)