Heck it doesn't even take Military service or gunfire to kill your hearing. I'm 26, only a couple of years ago did I get into shooting more than once a year or so, and I have tinnitus, and difficulty hearing people over background noise. I'm a mechanic, and I mostly blame pneumatic tools. I now use earplugs when running the chainsaw, weed eater, hedge trimmer, lawnmower, or anything else I can think of, but I can't use them at work because with protection in I can't hear the other guys in the shop. I may have to try a set of the electronic ones that permit lower level sounds for work.