I think it's an aviation term. I vaguely recognized the term, but I've also worked with a lot of Air Force and Navy pilots over the years.
+1 - Something small enough to fit in the fuzzy hole area would be really nice, but no way I'm going to buy something that clearly has a Jeep profile on it. Maybe you could buy on of those vehicross.info bumper stickers and cut the VX out of it?