Col. John Chastain, 23d Maintenance Group commander, speaks during a change of command, June 17, 2019, at Moody Air Force Base, Ga. After being the commander for multiple squadrons within the Air Force maintenance community through various major commands, Chastain will be retiring today after more than 26 years of service to the nation and the Air Force. (U.S. Air Force photo by Senior Airman Erick Requadt)