This is one that has interested me, too, because soldier's knives get used harder than most. I figured if I was going to make knives that would stand up to what they were going to get used for, I would start with what gets used by guys who grab their knife for whatever they need to get done.
It seems that cost, availability, and easy carry are the three main decision makers, in roughly that order from first to last. The things that we knife geeks would think are important, such as steel type, blade shape, edge geometry, and so on, are secondary considerations.
It seems like you might also find a lot of variations according to specialty, since the needs of armor maintenance (my personal favorite) are going to be different from log section, and somebody in EOD may (almost certainly will) have completely different requirements for a knife.
I know that doesn't help answer the OP's question, but what I'm trying to say is that the best you might be able to do is a top twenty list, unless you sort it by specialty, in which case you would need a lot of space.