When you begin, go to the left. You will see a desk. Go over to it and pick up the weapons. Then, go outside. The alarm will go off. Try to shoot everybody in the area. Go into buildings, because some of them have weapons, ammo, and health packs. When you find one of your teammates, open the cell (you do not need a key). Give him one of your weapons and a health pack. Try to find the location that is all red. When you get out, follow the path to reach an area with a lot of enemies. Ignore them and let your men kill them. Get your man with the bazooka out, then run to the left to find a tank. Use the bazooka on it. You will then be in a building. Go through it and you will get outside.