Background
This document had been classified since 1939, and has never seen the light of day. In fact, at the time of requesting, even the title was classified, and was unknown. In essence, when I filed the Mandatory Declassification Review (MDR) request to the Department of Defense (DOD), I had no idea what I was going to find.
The MDR was a success, and the document was released.
Declassified Document
Report of the Coast Artillery Board on Project No. 1153, Heavy Antiaircraft Gun, March 9, 1939 [74 Pages, 10.9MB]
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https://documents.theblackvault.com/documents/dod/ADC955131.pdf
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