Ask any Chinook pilot about hearing loss.....the forward tranny just above yer noggin screaming itself to death gets to you pretty quickish.
For a laugh...follow three Chinook pilots down a hallway and listen to the five conversations going on.
I maintain helicopter pilots should get Brass Ear Trumpets at retirement instead of a Gold Watch!
My HF hearing is gone...done...fini. I hear bells, whistles, and screeching when awake....and get some quiet by running an electric fan or Air Con next to the bed.
My dear Uncle Sam has gifted me some nice hearing aids....which do not help much...T's, Z's, C's, P's, E's, D's....all sound the same to me. Kids and ladies with high pitched voices might as well be speaking Swahili for all the good it does me.