Mercenary (most based on "real-world" ideas for how militaries work):
1. Please fix the battle system for units. Specifically, the bit where units are different sizes for different unit strengths. This is militarily silly. For example, I can understand how unit sizes change for, say, a tank platoon or an infantry platoon, but why between similar types of unit? Why would a heavy infantry platoon be a different size than a regular platoon? Or Close Quarters platoon? (what the hell does that mean, anyway?).
2. Please describe, in the recruiting section or somewhere, how many admin or whatever are needed for a unit. We have to sort and recruit them, according to the rules, but how many do we need? One paper-pusher per 100? 1000? How many maintenance guys and gals for our tanks and planes? Or what?
3. Please give some sort of multiplier to tell us what pay should be for what size unit on the pay tables on page 53. As written, they don't make a lick of sense, since they have nothing to do with unit size. For a particular mission, if I have 20 cadre for a 3 month training mission, paying me 20000cr would be stupid; and yet, that's exactly the compensation package I can roll. What if I'm being paid to train a world's military and I've got 100 cadre trainers? Still could be 20000cr. That just doesn't make sense. Of course, that means the ticket creation rules would need to say how many troops are needed for a particular mission, unless the assumption is small squad sized military forces only (in which case, why the mass battle system)?
P.S. #4 - No need for base info. This section is useless, since there are no rules for making mercenary bases anyway. Also, some of it was just wrong (for example, the bit about TL 4 Merc bases being more about firepower than manpower - really? I'm assuming the writer meant WWII? Where would a merc unit get the industrial backing to run, say, their own tank pool in the equivalent of 1945? It was hard for small national governments to do it; how could a merc unit?).
In fact, I can't think of any era when manpower isn't what a merc unit is for. It isn't for firepower - that's beyond what a merc unit in our modern world can afford (or can get hold of, but that's a Law Level argument, I suppose).
So, yes, this whole section could be dropped out of the book, and not even missed I bet. There are no rules for keeping in supply, or having enough medics, or any of that stuff, so why bother with it? If numbers can be provided for how much is needed, then fine. But there aren't any at all anywhere, so why is it there?