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These days the US military tends to learn MMA, but this is what the old-school manuals were like.

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Eye gouging.

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Kneeing the nuts while holding a knife.

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Jaw strikes and such—apparently, this is the most efficient way for beginners to hit the chin.

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Jaw strike + knee to the nuts combo.

Stomping a downed opponent with combat boots. Since this is specific to boots, a soccer kick is probably better if you're just wearing regular shoes.

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Grabbing the junk during a clinch, along with Judo-style takedowns and standing joint locks.

Since this is ancient stuff from the World Wars, it lacks elbows and the variety of modern MMA. It also includes knife techniques.

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They claim you can quietly neutralize an opponent doing this shit. It was published in Korea under the title 'Real Combat Fighting.' I checked it out myself, nothing special.