Dougie, I have had Tinitus a.k.a. "gunner ear" (the high frequency ringing in your ears) for at least the last three decades and have learned to ignore it even though it is there continuously. I attribute it entirely to noise exposure while in the army (rifles, machine guns, howitzers, thunder flashes, grenades, etc). Interestingly, I had a hearing test just 4 months ago and apart from the Tinitus my hearing is in the normal range.
The bugger about that is now my missus knows that I am able to hear OK, she just accuses me of being an ignorant bastard. I don't know about your time in the green machine but ear plugs/muffs were not provided when I was in.
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