Well see though it is a trade off. Sure the AK is powerful, But you get more accuracy with like the M4. It may only take you 1 round with an AK to kill a guy, but if you are a trained operative or something then you can get those three rounds on center mass pretty quick. Doesn't matter how fanatical you are, you get three rounds in your chest and one to the head you are dead. I like Accuracy, power i could really give a shit. and most likely we will be engaging things in long or medium range in the beginning. Close range combat with a new type of species? That would be fairly deadly. This is of course my opinion. But you would want to learn their physiology first before you were going in close enough for an AK to definitely not miss it's target. And by the time we get to mutons we will probably have some sort of alien weaponry.