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Is it not typical for the military to have hearing protection? My highschool gun club had earmuffs with active noise suppression that would dampen sound above a certain DB level.

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It is common and a part of your uniform on a lot of bases i.e. you will get in serious trouble without them.

Depends... apparently doesn't help much if you're in a tank with a cannon a few inches from your head for 18 months.

Or using pneumatic tools for 12+ hours daily for weeks, or spending time underwater with the worlds most powerful sonar

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