i have a good example of how cover fire works. i was playing xroads and this is actually how i meat one of my better friends on socom. he doesnt play anymore but we still talk. anyways, there was someone in the bell tower and we were out of nades. i start climbing up and he sees me. well, my teammate below didnt even see him, but he spray up there like crazy. he gets his attention away from me and i am able to climb up for a kill.
this is an idea. someone is camping in the bomb room on sujo, have one guy go down to the end of the hallway leading into the demolition spot. one guy by the turret end of the hallway. the guy at the end shoots through the door to scare the m3, while the other guy then pops in while he is not expecting it. diversions/cover fire can save your life and end the enemies