Hello! I searched for the word military, because my book also had to do with the military and this post showed up. I couldn’t exactly understand my book because it was written in french, but the word I could is military. Even though I only searched a book that had to do with military architecture, as I was reading your argument, i noticed more similarities between our books. For example my book was almost the same size. Also the geometric drawings and examples of possible numeric formulas to calculate measurements where there . I also came to the same conclusion that my book was intended for everyday use and possibly also on the go. Have a nice day!
Anneke Iten de Leon