So pretty much it's starts out with north Korea taking control of south Korea and US inteligence finding out the north used American weapons and vehicles
The CIA find out who the person who sold the weapons are and they also find out that the traitor gave the Koreans a 15 megaton nuke and the plans to the XRIS or experimental robotic itegrated soldiers who can carry twice the weight of a regular soldier and hav better time getting to one side of the battlefield and back