As you can see by my screen name, I spent at least 20 years working in Army Education Centers. One of my positions was the MOS Library. We maintained and distributed military documents like FMs (Field Manuals) and TMs (Training Manuals) among others, before they went digital. I have just glanced at this document, a field manual, and it seems bona fide in its format, organization and wording.
Thanks to you , MarineMom613, and others for your information.