I have tinnitus from a shooting incident when I was younger, and as I sit here watching the old HBO show Band of Brothers about WWII paratroopers I realize just how many of these men would have been deafened by these experiences. I have to imagine leaders saw the problem immediately, but when were the first efforts undertaken to lessen it?
Depends on whether we're considering informal solutions and what counts as an anti-hearing-loss measure. More can always be said on this matter, and there's a lot of ground to cover, so if anyone would like to write further answers, please go ahead and type up! New posts are always welcome.
For the meantime, OP, you may be interested in these previous posts: