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That's my diagnosis at least. After skimming his letters for a while now, there are occasional references to his treatment at the VA. But his verbal style is classic schizophrenia. I don't think his posting rights should be banned, but I usually don't get much out of his letters either.
I wish the name were at the top of each letter, but I've gotten pretty good at guessing his letters from the first couple of incoherent sentences so I can move on.