Had I taken a life I would not speak of it, ever. But I dealt with classified information because I was a radio operator in a message center. I handled cryptographic keying materials on a daily basis including items that only officers were to handle. Well they don't set up the crypto equipment, I do, and when it stops decoding properly they ask me what to do. There are messages that state 'officers eyes only' , okay so well there is the routing table and the typewriter, you route the message then. Most of us had top secret clearance, some of us had a little higher and of course it was all based on a 'need to know' and didnt matter wether you had the necessary clearance or not.
I do like to converse with other service people, where they served, what their job was, what was the country like, how were the people, there are a lot of interesting subjects.