One thing I found out as far as "Expungement" goes is that the way they do the check through the FBI expunging does nothing. It will be there permanently no matter what you do. I am sure many get fired in ground school because they went through all this trouble to get their records either sealed or expunged thinking they would not get caught in the lie but they did.

I agree as much as the next person that we should not admit to what is not asked. This is not confession. But if asked; honesty is such a liberating force, really you might as well bear all (As far as answering the question completely). There is nothing worse than having even a crumb in the corner of your mind after turning your entire life upside down only to permanently wreak your career. For me it is much better to suffer the humiliation of being turned down.