In 2050, the United States entered World War III outnumbered and without allies. After 10 years of futile fighting and defeat the USA turned to a radical new strategy. It was discovered that every living thing generated an energy matrix. This matrix actually became more powerful after death. The Army decided to harness this "soul" energy, using it to make new weapons and super soldiers. With the power of the ghosts, the United States won the war, but at a terrible cost. Some of those infused with the energy became corrupted by it and one very powerful, very evil soul took control of the greatest warrior of the entire conflict. Thus it was that the "Ghost army" took control, and the world was cursed.