Mmburg: My father was in the Bureau for twenty something years, he was a city cop for 9 years before that. I remember growing up that he was required to have his weapon a reasonable distance from him at all times, even when we went to the beach. So whenever we got pulled over he would present his DL, and the would flash his creds while saying "and I am armed."

I completely agree with letting the cop know upfront that you are armed, it makes it much easier on them knowing that you are. Those that wait and have the cop ask are going to have a harder time connecting/communicating nicely with the cop. (with the caveat that the cop isn't a jerk)

Craig: You're an idiot. The last thing you should do while holding a clearance of any type is say "I have a clearance." Use the knowledge of holding a clearance anytime, but stating that you do is just stupid. Hopefully social engineers haven't spotted you yet, it seems like you'd provide quite an easy target.