Colonel Thomas G. Mizell was commissioned an Infantry Officer upon graduation from Officer Candidate School Class 8-52, 3 March 1952. His first duty assignment was as Platoon Leader, Heavy Mortar Company, 135th Infantry Regiment, Fort Rucker, Alabama. | His subsequent duty assignments include: Platoon Leader, Company D, 135th Infantry Regiment, Fort Rucker, Alabama; Commander, Company I, 135th Infantry Regiment, Fort Rucker, Alabama; Platoon Leader, Headquarters Company, 167th Infantry Regiment, Army National Guard, Alabama; Commander, Company A, 279th Signal Battalion (Corps), Huntsville, Alabama; Assistant Operations Officer, 142nd Signal Group, Decatur, Alabama; Deputy Chief of Staff, Resource Management, 87th Maneuver Area Command, United States Army Reserve, Birmingham, Alabama.