In 2054, United States Marines Private First Class Jack Mitchell (Troy Baker) and Private Will Irons (Paul Telfer) help repel a North Korean invasion of Seoul, under the command of Sergeant Cormack (Russell Richardson). During the fight, Will is mortally wounded and Mitchell loses his arm, resulting in him being medically discharged. Following Will's funeral, Mitchell accepts a position at the Atlas Corporation, a private military corporation, by its CEO Jonathan Irons (Kevin Spacey), Will's father, and is given a prosthetic arm.