You are the last man man in your squad and you are stuck in the middle of the desert at a paratroopers landing location. You can either stay and fight or you can run.. you don't have a choice you have to stay in your bunker and shoot all the soldiers that come to attack you. Use your minimap to see the location of where the next soldier will drop then you can turn yourself that way and usually shoot them down before their feet touch the ground. Keep an eye out for relief packages containing ammo and other things. Tanks will be rolling in... you better be clever when it comes to taking them out.