Depending on the tree, there are various variants available, and they exclude each other.

The below chapter should make it easier to pick the doctrine that will harmonize with your playing style.

The main goal of this doctrine is to wage war basing on vehicles.

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This one is an important variant for all the players who focus on using vehicles and small infantry divisions.

Also, defense advantages from the doctrine are important, which in certain situation affect development of guerrilla actions.

This doctrine concerns all of the land units and this is what makes it an universal one.

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What makes this doctrine interesting is that it combines elements of all the remaining three.

Mass mobilization of soldiers and attacking on several sides simultaneously is in this case key to success.

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Hearts of Iron IV