If you are reading Resistance to Tyranny you will find this as an important book to read. As a former member of the U.S. Army, I can tell you field manuals are written like those instruction booklets that come with cheap furniture and such. So as valuable as the information may be, I doubt it will be entertaining enough to keep you awake so you might want a few pots of coffee on standby.
I can offer one bit of advice to reading Field Manuals, do it one chapter at a time and reread it a few times, keep a notebook and write down a very concise paragraph or two to refresh your memory for each chapter. Yes, it’s a pain but you can learn it. If you’d prefer, there is a .pdf download available here.