His proper title is "Mr Vindman". Few people in RF address me as "Gunny". Some retirees do out of respect, and people on base and I think Navy Federal still does. USAA does. My daughter does when she is attempting to get something into my head
.
Otherwise, I get called "Grandpa" or "hey you" a lot more
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Even when I was a kid I thought retired military people demanding to be called by their military rank was really petty.