Storyline
Spoiler warning: The following article runs through the ENTIRE campaign, if you have not yet completed the campaign it is recommended you do not read the storyline below.
In October 1944, Private Thomas Wyatt and a group of soldiers infiltrate an IJN-controlled island in the Sea of Japan. Wyatt's squad secures a Japanese scientist who was working on Aurora, a supposed secret weapon. They escape the island on a submarine but as foreshadowed by the scientist's warnings, Wyatt and the commandos witness the firing of the Aurora and perish from the attack.
In the present day, Privates Preston Marlowe, Terrence Sweetwater, George Haggard, and Sergeant Samuel Redford fight behind enemy lines in Russia in attempt to secure a device related to Aurora. Despite escaping Russian soldiers and completing their believed final mission in their service, the device is discovered to be a fake. Being impressed with their previous activities, Army General Braidwood assigns them to a special operation of stopping Aurora, much to the chagrin of Redford.
The squad travels to Bolivia in search of an agent named Aguire. Through many firefights, they save Aguire. Aguire requests the squad to get all his intelligence detailing Aurora from a French satellite that can be controlled from a base in the Andes Mountains. Sweetwater crashes the satellite and Marlowe finds the intel device upon the crash site.
During extraction, Aguire briefs the squad about a man responsible for rebuilding Aurora named Arkady Kirelenko; a Russian Army colonel the squad failed to eliminate in Russia. Kirelenko is believed to be hiding in Chile. Marlowe and the squad aided by US forces find Kirelenko, though he soon escapes. Left only with papers from Kirelenko, Sweetwater discovers they are a shipping manifest for an abandoned ship called the "Sangre Del Toro." Aided by the rest of the squad getting the coordinates, Marlowe finds the ship and retrieves an unnamed compound essential to the use of the weapon.
The squad gets separated when attempting to meet Aguire in Colombia. Along with their helicopter pilot Flynn they regroup and escape the local militia. Marlowe gives Aguire the compound before finding out that Aguire double-crossed the squad by allying with Kirelenko. It was believed that he wanted revenge against the United States for what happened to his father in October of 1944 revealed by Sweetwater as Private Thomas Wyatt. Despite the alliance, Kirelenko betrays Aguire and kills him. Flynn intervenes and saves the squad at the cost of his own life.
In a city, Marlowe and the squad find an airplane that is believed to house Aurora. The weapon releases a powerful electromagnetic pulse, destroying all electronics in the city and thereby causing all military vehicles to cease functioning and, in one instance, nearly crash onto the squad. Everyone except Marlowe becomes disheartened of continuing the mission. Marlowe encourages them to get on the plane. The squad infiltrates the plane's lower levels as it takes off. After a firefight to reach the cockpit they find it empty. The squad returns to the cargo bay to find Kirelenko attempting to launch the Aurora again, now high over the south US and thereby causing havok on the power grid and crippling the country's ability to defend itself against an attack. After Marlowe destroys Aurora, the squad escapes the plane with Kirelenko trying to grab the last parachute in mid-air. In a free fall, Marlowe kills Kirelenko before getting the parachute from Sweetwater.
The squad lands and regroups in Haggard's homestate of Texas behind the destroyed airplane. Shortly after, General Braidwood drives by to inform them to help aid the incoming Russian invasion that recently passed through Alaska and Canada.
