That dude needs to spend a full day just sitting in someone's teamspeak and watching their live stream. Let them talk to him as they do warzones.
Imagine 8 days of sitting in on a few different players of each class.
Imagine him having bringing as much professionalism to his work in this game as my dog does to taking a crap in the yard. She usually spends a good 5 minutes finding a good spot. That's 5 minutes longer than the time he's put toward commandos.