Lost much of my hearing in the late 60’s due to a reaction to antivenin. The rest was lost while serving with the 502 during Vietnam, field artillery plays hell on the hearing.
My 30 year old SIL got his 10% disability as a matter of the process at Fort Sill a few years ago. He said almost everyone “qualified” because of the damage done during Artillery Training.
Based on what my daughter says, his hearing is selective at times now. LOL.