William T. Nesbitt was commissioned an Infantry Officer upon graduation from Officer Candidate School 27 January 1967. His first duty assignment was as the Commander of an Operations A Detachment in Company B, 5th Special Forces Group (Airborne), Fort Bragg, North Carolina. | His subsequent duty assignments include: Executive Officer, A 421 Company D, 5th Special Forces Group (Airborne), Republic of Vietnam; Personnel Officer, B 52 Company D, 5th Special Forces Group, (Airborne), Republic of Vietnam; Assistant Personnel Officer, C14, Company D, 5th Special Forces Group (Airborne) Republic of Vietnam; Executive Officer, Headquarters and Headquarters Company, 1st Battalion, lO8th Armor, Georgia Army National Guard, Assistant Operations Officer, 1st Battalion, 108th Armor Georgia Army National Guard, Calhoun, Georgia; Executive Officer, Ist Battalion, 108th Armor Georgia (ARNG), Calhoun, Georgia; Recruiting & Retention Manager, Georgia Army  National Guard, Atlanta, Georgia; Operations Officer, Georgia Army National Guard, Atlanta, Georgia; Plans, Operations & Training Officer, Headquarters, Georgia Army National Guard.
He is currently serving as the Plans, Operations & Training Officer, Headquarters, Georgia Army National Guard.