Ok, i'll take a shot at answering at least some of your questions....
It would probably be special forces type guys carrying Busses, or people in a combat zone. From what i've heard, there are severe restrictions on what military personal can cary on base.
I don't think there are Busse knives sold only to the military, as far as i know the only kind of knife that can't be sold to civilians is an automatic, and i can't see why busse would not tell us about them.... word would probably get out anyway. So i doubt it. But he may sell to them at reduced prices, and i'm sure i've heard people complaining about production schedules put back because of large military orders...
As for shop tours, i have no idea.... you'll have to wait till someone more knowledgeable than me arrives.
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The beast we are, lest the beast we become.