In 2054, a terrorist group named the KVA makes a worldwide attack. It destroys nuclear reactors of countries, like the United States. Many countries' military and government including electricity and technology were broken. That keeps the countries from being able to fight the attack made by the KVA. Private militaries have become the new attackers on the enemy. Jack Mitchell (Troy Baker) is a former U.S. Marine. He lost his left arm during a battle in South Korea. He joins Atlas, the world's most powerful private military with the most biggest technologies on the planet.