I have just past the area where you are told that the guys are heavly armored. I go through a door and kill 3 guys in a medical area and there are 3 more guys in a room at the one end of the area. I have crossed the room from the door I came in from and past through the door and past through another door on my right. At the end there are guys trying to kill the monster and two come around the corner I kill them I then get use of the heavy machine gun but I can't seem to kill off all the monsters. What in the world can I do to get past them all?