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There are three different doctrines: Eastern, Western, and European. Units in the Western doctrine have the highest hitpoints, but have high research and building costs. Units in the Eastern doctrine have the least hitpoints, but have low research and building costs. Units in the European doctrine have intermediate hitpoint values and costs.
The last 2 levels of the main battle tank in the Eastern doctrine have more power against other tanks than the other doctrines. (please check if this is still true)