Years ago, pre 9/11, I borrowed my brothers jeep. He’s a USMC 0-6. As I drove in to Quantico every enlisted person was saluting the Jeep because of a sticker on the window.
I think those stickers are gone now.
That happened to me one summer at Wright-Patt. I was working a summer job with MWR (Morale Welfare, and Recreation).
I drove my Dad’s Buick to work with his Colonel insignia and got saluted at the gate. When the Sergeant I was working with rode with me to lunch, he got a huge kick out of the salutes coming back on to the base.