Your chopper crash-landed at an urban war zone. Use your machine gun to get through the hostile enemy soldiers while moving closer to the extraction point.
Survive the night fighting off zombies from your barricade. Survive longer than a day by making use of the daylight hours effectively by repairing your barricade, searching for weapons and looking for other survivors to help repair and defend.
You've been causing too much trouble behind enemy lines. They're going to take you out the only way they know how. RunNGun as many as you can before destiny catches up with you.
It's a nightmare. You are trapped in an abandoned mine with an injured comrade at your side against God-knows-what. Make your stand, get out alive. Three words of advice: shoot to kill. These things are not human, they are monsters..