Call signs don’t really follow a protocol so much. It’s a name, just has to fit. The guy getting it doesn’t have to agree... it just is what it is, has to fit.
I got Tools very early, another student in a 4 plane form hop as I was showing up for the brief, and who had been to my shop a fair amount, simply said, “hey look, it’s Tools Danford.” And it stuck.
I did PLENTY of stupid things to get it changed, and there were attempts, the others just didn’t “fit”. One time they couldn’t make up their mind, Goldy, Chunks, Spew, Fish and a few others, I’ll let you guess what happened. Just didn’t fit.
I’d show up to the next training squadron, with a callsign, would get grief, I’d be like what ever... invariably someone would need something fixed, and “Tools” would live to fight another day.
Some guys are NEVER gonna not be called Nose, you know the type... Aaron Kazarian, he’s just Kaz... forever.
Hydrant, he shouldn’t have told us his dog ****ed on him when he was passed out in the kitchen... who says you don’t pick your own?!!!
Cow, a major, and a dick head, liked his callsign. Just never figured out it stood for “captain one way”. That was never gonna change...
And so it goes.