They should probably rename it from "tail" to "neck" and watch the attitudes shift immediately.

Tooth to tail is crappy PC/corporate-approved rename. The concept used to have a bunch of arrow and spear related names and a bunch of informal phallic counterparts all of which are better suited to the fundamental workflow of mechanized offensive operations.

For curiosity’s sake, what were these things referred to historically and informally?

That should call it coccyx. That sounds like something Trump would support.

Or maybe "dentures"?

That will certainly resonate with the generals (≧▽≦)