United States of America/Modern Warfare

Second Russian Civil War (2011)
The fictional plot of Call of Duty 4: Modern Warfare portrays the United States as having involved itself with the Russian Loyalists and the United Kingdom in military actions to dissolve rebel activity in Russia and the Middle East during the Second Russian Civil War. After the execution of Yasir Al-Fulani, the country decides to send a multitude of Marines to locate the man responsible, Khaled Al-Asad. After failing to secure him, much of the United States' forces are wiped out by a nuclear attack, the first time a nuclear device would be used in warfare since World War II. Ironically, this attack was against the first and last country to use the weapon since. The United States, along with the Russian Loyalist and United Kingdom forces continue to pursue a campaign to find members of the rebels, killing three out of the four leaders or "Four Horsemen". The campaign is presumed to be continuing in Russia at the end of the game.

World War III (2016)
In the plot for Call of Duty: Modern Warfare 2 the U.S., the United Kingdom, Canada and Australia form a group of elite soldiers that is called "Task Force 141", led by Captain "Soap" MacTavish of the Special Air Service, with other notable members being John Price, Simon "Ghost" Riley and Gary "Roach" Sanderson.

The United States appears to still be embroiled in Afghanistan as the 1st Battalion, 75th Ranger Regiment is in the country at the beginning of events of Modern Warfare 2. The events in No Russian, committed by Vladimir Makarov and his group of Ultranationalists (including undercover Army Ranger Joseph Allen aka Alexei Borodin), stir public outrage against the United States when Makarov kills Joseph Allen to successfully portray the bloodbath as an American-backed terrorist action.

The United States itself is then invaded by Russia, triggering a devastating war in which Washington D.C. and the surrounding area becomes the battlefield. Civilians and other key personnel are evacuated from the D.C. area (via the Washington Monument) while the military attempts to retake the city.

During the siege of the American East Coast, Task Force 141 along with the American 6th fleet are sent on the offensive. Their task is to disable SAM sites on oil rigs for the inevitable assault on the Russian mainland to retrieve Prisoner 627 from a gulag on the Kamchatka Peninsula. Afterwards, Task Force 141 and the rest of the supporting American forces, go on actions to locate and kill Makarov.

After the events of Of Their Own Accord and Second Sun, the detonation of a nuclear weapon in the atmosphere above Washington D.C. causes an EMP wave over the city and surrounding areas, which disables all electronics and equipment. This enables the U.S. military to eventually take back control of Washington D.C. from the overwhelming amount of Russian vehicles and troops.

However, it is later revealed that General Shepherd engineered the entire war in order to rise to glory as the man who wiped out terrorism, as well as ensure there were never any shortage of volunteers in the U.S. military. After killing Roach and Ghost, he is tracked down by Soap and Price. After a battle and an exchange of fists with Price, he is killed by Soap, who throws a knife into his eye.

With the battle won in Washington D.C., the United States focuses on retaking the rest of the East Coast. By August 17th, 2016, New York City is the last Russian foothold in the United States. The U.S. Military dispatched Metal Team of the Delta Force to disable a Russian Jamming Device that was prohibiting U.S. Satellites from seeing the Russian-held region from above. Team Metal moves to the jamming tower's location atop the Wall Street Stock Exchange building, where it is destroyed by an explosion at the base, giving the U.S. a view of the city. Soon after, the U.S. Military Command authorized a bombing run on all known Russian emplacements, crippling the mainland Russian Forces. Later that same day, the United States Navy Seals, with the assistance of Delta Team, infiltrated and commandeered the Russian Command Submarine in the New York Harbor. They use the Sub's payload of cruise missiles on the majority of the Russian Naval Fleet in the Harbor, forcing the Russian Invasion Force to retreat that same day. By October 3rd, 2016, all Russian Forces are withdrawn and a peace conference is scheduled in Hamburg.

However, the Russian President Boris Vorshevsky is captured by Vladimir Makarov. The peace treaty is canceled. Later Makarov detonates Gas bombs through Europe and Russia soon invades Europe. The U.S. responded by launching its forces to rescue the U.S. Vice President and aid its European allies, by the time the war ended most of the U.S. East Coast is in ruin and an unknown number of U.S. soldiers and civilians are dead, wounded or missing.

After Russian President Boris Vorshevsky and his daughter are rescued by Delta Force and the disavowed Task Force 141, the peace treaty is signed and relations between the United States, Russia and develop into friendship and peace. President Vorshevsky later starts reconciliation with the Loyalists and offer them their full protection and allow them to return to Russia and start a coalition government with his government and relations of friendship and peace increase between the United States, Russia and NATO with the new Ultranationalist-Loyalist government and Russia joins NATO.

Assault Rifles

 * M16A4
 * M4A1
 * SCAR-H
 * ACR
 * M14
 * SCAR-L

Light Machine Guns

 * M240
 * M249 SAW
 * M60E4

Sub Machine Guns

 * Vector
 * MP5
 * MP5k
 * UMP45

Snipers

 * Barrett .50cal
 * M40A3
 * R700
 * M14 EBR
 * Intervention

Shotguns

 * W1200
 * Shotgun (attachment)
 * M1014
 * AA-12
 * SPAS-12

Pistols

 * .44 Magnum
 * USP.45
 * M9

Launchers

 * FIM-92 Stinger
 * FGM-148 Javelin
 * AT4
 * SMAW
 * Thumper