Former U.S. Marine Corps Sgt. Art Davie, Ultimate Fighting Championship co-founder, gives a leadership talk to U.S. service members during the Mixed Martial Arts Legends Tour at Joint Base Langley-Eustis, Va., Nov. 30, 2017. Davie spoke about his five principles of leadership: be professionally competent, accept responsibility, make smart decisions, empower the team to contribute and keep the team informed. (U.S. Air Force photo by Senior Airman Kaylee Dubois)