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[–] torky 0 points 4 points (+4|-0) ago 

...make a lot of noise to cause a big psychological effect to the enemy

It's just whistle, how bad can it be.

Plays Death Whistle

Oh fuck. Just one of those is a horror in itself.

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[–] 3131503? ago 

Other videos of death whistles have a much more mild sound. I'm not sure if it's because this guy was using a microphone or if the design is unique.

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[–] nebula0024 0 points 1 point (+1|-0) ago 

Yeah, I'd be pretty scared if I heard a hundred of those in the distance, too. Definitely for psychological effect.