This is my fault.
S19 was the file code for ships paint and S19-7 was the sub code for camouflage, which was where a lot of this documentation was filed. The "April 19th JJ52 memo (actually looks like it was April 1st on my site) was filed under "JJ52, which was "material" instead of paint. These are little details and pedantic, as I said, but it doesn't help clarify things when people start off with a somewhat confused foundation, and I apologize for my part in that.
I've since expanded the titles on my main page in the hopes it will give people a better understanding of how those documents fit in to the flow of Navy communication and why some might have been confidential or not or where they were found and why. Previous Message
I stumbled across this chart while searching for something entirely different. Thought it was interesting to share. This is NOT intended to start a controversy:
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