I think the military has been issuing earplugs for some years now. I further believe they are not nearly enough. My experience in the military...non-combat...was four years of pistol team competition with decent earmuffs. Even at that though the damage is cumulative.
Was given some industrial strength ear plugs once, while helping out with the church teen group. They would play their band so loud, it was impossible to hear yourself think. They just looked like the little orange foam plugs like you can get at any sporting goods department, but unlike those, they completely blocked all sound. I could hear NOTHING, with those ear plugs.