World of Tanks
World of Tanks is a MMO (massively multiplayer online game), featuring combat vehicles from 1930-1960 including light, medium, and heavy class tanks - including tank destroyer or self-propelled gun.
With six primary game types, you take control of a single vehicle, and are placed into battle of a random map. You control the movement, firing and aiming, and can communicate with your allies (other players). It's a great choice for anyone who loves historical warfare, as well as frenzied assault style games - with a flair of tactics.