Original U.S. WWII Office of Naval Intelligence ONI 41-42 Japanese Naval Vessels Identification Guide Book - Unused Condition Martini-Henry Parts The distinctive unit insignia was

The distinctive unit insignia was originally approved for the 87th Mountain Infantry Regiment on 21 October 1942

but still has markings on the end

It is basically a rigid version of the M1915 Field Cap with a rigid fiber or leather visor

the more durable ripstop had taken over the majority of production and 1969 saw the end of poplin production as manufacturers finished out early 3rd pattern contracts with stock poplin material on hand

Nicely marked on the right side with the magnification information:

Original U.S. WWII Office of Naval Intelligence ONI 41-42 Japanese Naval Vessels Identification Guide Book - Unused Condition Martini-Henry Parts The distinctive unit insignia wasOriginal Item: Only One Available. Now this is a fantastic condition Office of Naval Intelligence identification book for Japanese Naval Vessels. The book is in wonderful condition and does not appear to have ever been used, or was just very lightly used. This type of knowledge is very important when it comes to large scale warfare. The battlefield, seas and airspace get heavily clouded with friendly and enemy vehicles, so it is important to be able