A group of rivals lives in the valley. Their attempt is to capture Charlie base. Your mission is to protect the camp from them. They come to attack through the canyon. Your task is to destroy them before they enter the camp. You will be given special weapons and ammunition. Use those weapons and equipment to suppress the enemy.

There are several major wars to be fought against them. As the wars continue, the enemy continues to gain strength. So you too have to improve militarily.