"I'll stand by my assertion (based on twenty years as a professional typesetter) that the type on the documents is not Times Roman, nor is it Palatino, as others have suggested."
I see by your profile that we share some common interests. I have a thirty year background in printing equipment sales and service. I repaired small offset presses and have seen the Composer in use, did you ever know anyone to use a Composer as an office typeWRITER as opposed to a typeSETTER which it was designed to be? I suppose a printer might occasionally have done so but I can't imagine a guard base having a typeSETTER instead of a typeWRITER.
Well, I'm not so proud that I can't back off if the situation warrants it. Yes, whatever font was used on those memos seems to have a square serif, which a Dutch oldstyle like Times Roman isn't supposed to have. But since the space values match up identically with those of Times New Roman in an MS word document, I've had to ask myself if perhaps I'm not mistaken. All I can think is that successive generations of photocopying lent so much "gain" to the originals that the usually-bracketed serifs of Times Roman simply appear to be rectangular. I did a little experiment with photocopying, and found that this was, indeed, the case. That's the only way I can explain things at this point. If I could see the originals, I'd know for sure.
I agree that it's highly unlikely a composing machine like the Composer would have been used as a simple office machine; nor would it have been used by a person who by all accounts was no typist, to produce copy that has no ostensible corrections. The whole thing beggars the imagination.
The fact that these are such obvious fakes indicates to me that whoever is responsible for making them public wanted them to be seen as fakes.