Thomas retires after 23 years of service Published Nov. 10, 2016 Col. Imelda Reedy, 14th Medical Group Commander, presents Chief Master Sgt. Brandi Thomas, 14th MDG Superintendent, with her certificate of retirement Nov. 4 at Columbus Air Force Base, Mississippi. Thomas served for 23 years in the military. (U.S. Air Force photo by Sharon Ybarra)