Even combat aircrew don't live in isolation from the rest of the world and it is naive to think that by scrubbing some low grade information from perfectly normal sources you are protecting anything. Having done CAC, Bad K and other courses the lesson I took away was don't be surprised that they know where you went to school, or the name of your award winning budgy etc. I also realised the complete futility of the Big 6 - they know more than that, you know they know, they know you know they know etc etc.
Answer talk lots but say little. Just a view