TA meaning in Military and Defence ?

Total Annihilation is a real-time strategy video game created by Cavedog Entertainment, a sub-division of Humongous Entertainment, and was released on September 26, 1997 by GT Interactive for Microsoft Windows and Mac OS. Two expansion packs were released, The Core Contingency on April 28, 1998 and Battle Tactics on June 30. After the closure of the Cavedog Entertainment in 1999, the intellectual property fell to Infogrames (now Atari).

Total Annihilation is no longer officially supported, due to the closure of Cavedog. Former lead designer Chris Taylor went on with Gas Powered Games to create Supreme Commander in 2007, considered the "spiritual successor" of Total Annihilation. The creators of XTA, a mod for Total Annihilation, independently developed the open-source 3D graphics Spring game engine. The Total Annihilation 3D project began in 2006. Other ex-members of Cavedog, including Total Annihilation's game engine developer Jon Mavor, later went on to develop Planetary Annihilation in 2014, another game in the same vein as Total Annihilation.

In July 2013, Wargaming bought the Total Annihilation franchise from the Atari bankruptcy proceedings.