U.S. Air Force Lt. Col. Darin Nitschke, 307th Medical squadron optometrist, leads the 307th Medical Squadron in saluting Col. Louie Fehl during the 307th MDS change of command ceremony at Barksdale Air Force Base, Louisiana, September 8, 2019. Fehl served asthe 307th MDS commander from 2017 to 2019. (U.S. Air Force photo by Senior Airman Maxwell Daigle)