Some random comments:
You need to fade out your background, black text gets lost against background frequently and white/yellow text is impossible to read over the lighter areas. Fade the background and put colored text on a darker, more solid background or callout.
Crop down your images so that only the important parts are visible letting you have more "zoomed in" pictures. Many of the examples are so small as to not be able to read any text or easily see the differences since they are all full screen images (with a lot of space not needed) and compressed and shrunk down too small to be useful. You have to zoom in to 300% for the text in pictures to be clear.
Your briefing section doesn't actually tell people how to add briefings, instead it tells how to use a 3rd party program? Why entirely leave out such an important section?
Not including a classlist due to "space" is a really odd decision.
Making the TOC be links would increase usefulness of the PDF as well. The bookmark section is nice though. Page numbers are 1 off from the PDF pages however.
Printing isn't bad, except for the black text on background issues and many pages with negative space at the bottom.
Also wouldn't have used addon maps, like the Vietnam one, for examples. It only leads to confusion and "I can't get this to work" type situations. Instructions should be as default as possible.
Might be nice to include a "companion" file with this with all of your examples so people can see in the editor how it should be.
Firstly, I've changed the white/yellow text, I just have to update the file. That's fixed.
Second, if you zoom into the images they are easily readable because they are 1080p images. Simply use Ctrl+Mousewheel
About the briefing section, there's everything you need to know. It tells you where to place the files and how to create them. I dont know what to tell you. The third party program is there because it makes it much easier than writing codes. It says there you simply have to save the briefing file in the mission folder and it says how to create the init file to show the briefing at the mission begining.
Yeah, the classlists really aren't there due to "space"
but because I didn't have the nerves to put them in the manual. Yet.
Yes, I thought about adding the links. I actually hoped MS Word would transfer the hyperlinks into a PDF when I select "Save as .pdf...". Turns out it didn't. I'll include that in the updated version.
I really didn't notice any problems with black text on background, but if you say "printing" and you literarilly mean printing it on a piece of paper, I gotta tell you the manual was optimized for PC usage and for Adobe Reader/Acrobat to be honest.
I've used a couple of addon maps, but I've added a note at the begining that the screenshots were taken of a modded version of ArmA II: Combined Ops, but that the principles remain the same. I don't see why you wouldn't be able to get it to work just because it's another map.
I never thought about the companion file. I might publish it, but separately from the manual. Still just an idea, though.