I've seen that too (well, not NOFORN, obviously)—although in some case it is the result of the embassy (or whoever) classifying information that is already circulating in the field.
On the issue of wikileaks and the capabilities of Warlock Red/Green et al, there's good reason to keep data on this sort of stuff classified even after the system has passed out of widespread US usage—allies or locals may still be using older systems (or might be in future). I certainly used to use comms stuff in the 1980s that Ken would have remembered from "a generation" earlier
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