TATV, short for Tracked Armored Training Vehicle, known officially to the war department as Training Vehicle, Tracked, Armored, is the generic term for any heavyweight armored vehicle once in service with the UEG military or one that failed to enter service, and therefore was used primarily in training exercises to train tank crews.
There have been many TATVs (pronounced tat-vee or tat-of) in UEG service throughout the years.
Most TATV models once served, at one time or another, in UEG Marine or Army service before being deemed obselete for frontline combat. Some models, however, were originally designed for the frontline but failed to meet the standard requirements, and instead of completely getting rid of the concept, were commissioned into training programs.