Colonel Thomas D. Seargeant was commissioned an Infantry Officer upon graduation from Officer Candidate School Class 25-69, 8 August 1969. His first duty assignment was as Platoon Leader, Company C, 7th Battalion (Mechanized), 6th Infantry, 2nd Armored Division, Fort Hood, Texas. | His subsequent duty assignments include: Executive Officer, Company C, 7th Battalion (Mechanized), 6th Infantry, 2nd Armored Division, Fort Hood, Texas; Assistant Senior Advisor, Mobil Advisory Team, IV Corps, Military Assistance Command, Vietnam, Republic of Vietnam; Senior Advisor, Mobil Advisory Team, IV Corps, Military Assistance Command, Vietnam, Republic of Vietnam; Chief Instructor, Recondo School, III Corps and Fort Hood Troop School, Fort Hood, Texas; Exercise Controller, 75th Maneuver Area Command, U.S. Army Reserve, Fort Bliss, Texas; Instructor, Texas National Guard Academy, State Headquarters, Austin, Texas; Assistant Operations Officer, Texas National Guard Academy, State Headquarters, Austin, Texas; Security Officer, Military Support, State Headquarters, Austin, Texas; Operations Officer, Texas National Guard Academy, State Headquarters, Austin, Texas; Operations Staff Officer, Operations and Training, State Area Command, Austin, Texas; Chief Operations Officer, Operations and Training, State Area Command, Austin, Texas; Personnel Management Officer, Office of Personnel, State Area Command, Austin, Texas; Personnel Officer, 1st Brigade, 49th Armored Division, San Antonio, Texas; Inspector General, Headquarters, 49th Armored Division, Austin, Texas;  Personnel Officer, Headquarters, Troop Command, Austin, Texas; Director, Personnel and Administration, Headquarters, 111th Area Support Group, Austin, Texas; Executive Officer, Headquarters, 111th Area Support Group, Austin, Texas; Deputy Commander, Headquarters, 111th Area Support Group, Austin, Texas; Comptroller, United States Property and Fiscal Office for Texas, Headquarters, State Area Command, Texas Army National Guard, Austin, Texas. | At the time of his induction, Colonel Seargeant was a Supervisory Logistics Management Specialist, United States Property and Fiscal Office for Texas.