More than half way through, one of the more interesting aspects about the AI is how they adapt to your playstyle. After exclusively sniping, all soldiers wear hard helmets, armored vests, and have riot shields. If I don't shoot them in the much smaller window of the face, their helmet will fly off and they will be dazed for a second, if you don't take them out by then they can alert the base they are under attack. This took place over a decent timeline and when I listened to enemies talking to each other they even discussed the new equipment they heard was going to be issued and how they hoped it would be soon.