AdvertisementArmy's Smart Earplug Damps Explosive Noise, But Can Enhance Whispers03:13Download AudioResumeJune 03, 2016Joe PalcafacebookEmailSgt. Jessie Bacon uses the Tactical Communications and Protective System to relay information to his squad in Fort Bliss, Texas. About 20,000 of the devices have been deployed so far. (U.S. Army)