It is a reward given out in some contests, where the winner is then allowed to choose exactly what type of tank he wants. So perhaps for an example; I won a contest, and the reward was a dream tank. I then decide to get an M4 Viking with M4 Smoky and Lumberjack paint. The reward of a dream tank, is literally based on the receiver's dreams, and what they think would be the most amazing tank!
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