Something I've noticed is that chevrons (e.g. used for non-commissioned ranks) point upward for military, naval, & air force services and downwards for civilian services such as police. I've heard tell that it's to do with symbolically distinguishing between "masculine" community service roles (daggers) and feminine community service roles (cups). While I am confident of the observation, I'm not confident of the explanation as I'm yet to trace it back to primary sources. So if anyone wants to elaborate or suggest some primary sources of commentary for this little cultural bugaboo, I'd find it interesting reading. :^) I mention this because getting the chevrons the wrong way up seems to be a fairly common mistake in texture design for computer games.