Maxwell AFB, Ala. - Lieutenant General Anthony Cotton, commander and president of Air University (left), presents the Air Command and Staff College guidon to Col. Evan Pettus during a change of command ceremony, July 27, 2018. Air Command and Staff College is the in-residence and distance learning professional military education college of midcareer officers and civilians, focused on the development of air-minded joint leaders.(US Air Force photo by Melanie Rodgers Cox)