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The US Army is deploying smart earplugs that block out loud noises and enhance quiet ones | TechCrunch
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TS TAC-SKY Military Ear Plugs Tactical Ear Plugs Pickup Noise Reduction Ear Plugs For Shooting Hearing Protection Portable And Light Weight Can Be Used With Tactical Helmets (Color : T) : Amazon.co.uk:
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Noise-cancelling headsets worn by soldiers can reveal the position of a sniper after a single shot | Daily Mail Online
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