good idea, but the hollywood stuff is not real. berserkers were mostly troublemakers who were too violent to live among other people, so they were sent to live in a separate area and called on when needed for war. early modern armies often did a similar thing, offering convicts their freedom in exchange for service. if you want real historically accurate berserkers all you would have to do is bring back convict regiments. the most violent criminals can then choose to serve their life sentences either in prison or in the marines.
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