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Could that relate to there being aspects of the program that just couldn't be put on paper and had to be discussed in person? Alternatively, were they concerned about in-house people at DOD ...
I'm guessing the latter, but could be both. The more of this I read, the more I think that the hacks do not believe what they did was in any way wrong. They don't act like conspirators. I wouldn't guess that they would think to avoid putting certain things on paper (I mean, look at what's in this document dump!), unless of course something happened to sensitize them in that way.
That something could have been an uprising in-house, either by outright public disagreement by more than one CCS, or through bureaucratic maneuvering (more likely). Then, people want to shut the door and whisper.
We've all seen something like this before, haven't we? The beltway DOD is a pretty strange place to work, possibly unique, but the organizational pathologies have their family resemblances in our own experiences. Would 'Dilbert' be at all funny if that wasn't true... ?