OK, so, talking to the hubby, he doesn't think that there's an actual regulation against chewing gum in uniform. But its one of those things where if you get caught doing it, you get chewed out. So why bother?

As for smoking, you can smoke in any uniform. When and where you can smoke are the things that are regulated. So, maybe 50 feet from the building is the smoke free zone. And, apparently, its against regulations to smoke and walk at the same time.

He's US Army, BTW. If that helps at all.