Maybe someone could do a small voice mod for air and artillery call-ins portraying a sense of urgency, and maybe some prc25 style impedence. Not meant as criticism for the game as what is there is fine, its just something that hasn't been modded yet. You tube has some actual recordings for examples. I know they are mostly viet nam, but it gives a good idea.
Also a voice announcing reinforcement arrival. On occasion with all the mayhem going on, explosions, tunnel vision, I have looked back wondering how long have those guys been sitting there.