WORLD WAR II NAVY Notebook -- Security, Signals, Cyphering -- S.E. SLAYMAKER III

Description

Measuring about 6-3/4" x 8-1/2", this paperback exercise book is
about half-filled with handwritten notes on a variety of sensitive military and naval topics including the classification, storage and chain-of-command rules for classified documents; radio signals, cyphering and codes; technical information on batteries, antennae and other radio equipment; convoy protocols; and other topics aimed primarily at the safety and security of the ship and the fleet.
I'm not sure whether the book is intended to be an on-the-job reference guide or just study notes for an exam. Or maybe both.
Handwritten on the front cover is the name "Slaymaker, S.E. 3rd", who is presumably the author of the notes. Although it is undated, the use of certain words and phrases strongly suggests the World War II era. Some of those clues include the abbreviations LST's (Tank Landing Ships) and Mersigs (radio communications with merchant marine vessels).
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