3M Fights a Growing Legal Battle Over Combat-Grade Earplugs

3M Fights a Growing Legal Battle Over Combat-Grade Earplugs

Former active duty U.S. army infantry officer Nathan Frei says from 2011 to 2015 he went through some of the most intense training that the U.S. Army had to offer. With it, came loud noises — everything from weapons to helicopters to explosions. To protect his...