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No co-operative play will be included in the campaign of Call of Duty: Modern Warfare 2, unlike the previous installment. In the Game Informer article, Infinity Ward stated that co-op campaign detracted greatly from the cinematic effect of the game no matter how they tried to implement it.

NPCs will carry customized weaponry, similar to custom classes made by players in multiplayer. A number of combinations were seen in the '09 E3 Demo, including AK-47s with ACOG Scope and FAMAS with Red Dot Sight. In addition, a different melee stance will be introduced, which involves holding a pistol with the combat knife out, supposedly allowing for faster knife stabs/slashes.

Gameplay in a Special Ops mission

Torture and hostage situations will play a role in the game, but it is unknown as to whether these situations will be part of gameplay or cutscenes.

Players will be able to dual wield side arms. In multi-player a new perk Akimbo will make this possible, and in single-player sets of two side arms can be picked up from the ground.

Perks will be able to receive upgrades that increase their effectiveness. It is not yet known how these advanced stages will be unlocked.

Objective way-points will now be marked on the screen itself, along with distance from the way-point in meters.
Special Ops

A new Special Ops mode will include two-player cooperative play. Special Ops mode will include several fast-paced action missions similar to Mile High Club which will be more difficult than normal campaign missions and will not be related to the main storyline. It will supposedly pick out certain parts of the single player campaign that "work well with co-op". Missions are unlocked by earning stars, which are acquired by playing levels at certain difficulties. Regular difficulty earns one star, hardened earns two, and veteran earns three. Missions will be divided by type, such as "Breach and Clear" and "Elimination".
Story
Characters

* Sergeant Gary "Roach" Sanderson will be a playable character.
* Captain "Soap" MacTavish (a playable character from Call of Duty 4: Modern Warfare) will return as a non-playable character. He has a mohawk and a model of his head will be sold with the prestige edition.
* Vladimir Makarov will be the new leader of the Ultranationalists and the main villain of the game, following the footsteps of Imran Zakhaev. His image is previously unknown.
* Major Petrov is the airfield commander in the level Cliffhanger and was probably killed as Roach and Soap eliminate all the enimies at the hangar unless he wasn't in your line of sight.
* "Ghost" will be a character part of Task Force 141 and will also be included in the Modern Warfare 2: Ghost six part comic series. He wears red ski goggles/sunglasses and a skull patterned face covering.
* Royce is a character seen in Rio de Janiero video. Not much is known about him at the moment, but he is probably a member of Task Force 141. Jundging by his accent, he is American.
* Rojas is an arms dealer located in Rio De Janiero. He wears a brown T shirt and 3 quarter pants. He is seen in the Worldwide trailer.
* "Meat" is a character briefly seen and heard in the Rio De Janiero video. At about 0:45 in the video you can hear one of your squadmates say "Meat, get these civvies out of here", at which point Meat begins yelling at them in Portuguese. Very little else is known about him. When he says "Roger that" it seems his accent is American. He may be the man who wears a helmet.

Plot

Russia is in political turmoil once again. Vladimir Makarov, a brutal leader and former associate of Imran Zakhaev, has set in motion a series of events that will threaten global security. After a series of vicious terrorist attacks, the situation is deemed dangerous enough for Task Force 141, led by Captain Soap MacTavish, to be deployed to Russia and Kazakhstan. There, the force must fight its way through near white-out conditions to infiltrate a secret military base hidden in the mountains. After detonating a large volume of explosives, the team loses the pursuit on snowmobiles. Task Force 141 is later deployed to Rio De Janeiro to capture an arms dealer linked to the plot by ballistics data (who is shot in the leg by Roach and left with Soap and another TF141 member, probably for interrogation), eventually being led to the barren lands of Afghanistan. But the intel Task Force 141 is receiving is likely inaccurate, as even they do not understand the danger of Makarov's sinister plot.
Title

Due to the commercial success of Call of Duty 4: Modern Warfare, Infinity Ward thought that the modern setting had entered unto a "world of its own," they then dropped the prefix from the title.[4] Activision was reportedly getting "bored" with the series, and so ran with the idea. It was later found from surveys that there was a 40% drop in brand awareness after the removal of the "Call of Duty" prefix. At E3 2009 the customer intent to buy the game had dropped significantly because of the title change. It is speculated that Activision chose to bring the Call of Duty prefix back in response to these surveys in order to prevent confusion with consumers.
Weapon List
The box art design used by retailers as a placeholder.
Robert Bowling (Infinity Ward's community manager) showing Modern Warfare 2's semi-final box art.

This is a list of all weapons that have been identified in official media for Modern Warfare 2.
Assault Rifles

* AK-47
* ACR
* FAMAS
* F2000
* G3
* M4
* M16
* L85A2
* TAR-21
* SCAR-H
* FAL

Sub Machine Guns

* UMP
* MP5k RIS
* TDI Vector
* P90
* Mini Uzi

Light Machine Guns

* M249 SAW
* MG4 (highly probable, seen in art book)
* RPD
* M240
* AUG HBAR

Shotguns

* Striker
* Remington 870
* SPAS-12
* Winchester 1887
* AA12

Sniper Rifles

* SVD (Also known as the Dragunov.)
* Mark 14 Mod 0 Enhanced Battle Rifle
* WA2000

Pistols

* Desert Eagle
* Glock 18c
* M1911
* USP .45
* M9

Grenades

* Frag Grenade
* Semtex
* Flashbang
* Stun Grenade

Miscellaneous

* Knife
* Riot Shield
* Ice Picks
* C4
* Minigun
* RPG-7
* AT4

Attachments

* Red Dot Sight
* EOTech Holographic Weapon Sight
* ACOG Scope
* Thermal Scope
* AUG Scope
* Sniper Scope
* Suppressor
* Grenade Launcher
* Laser and/or Flashlight
* Heartbeat Sensor
* Under-barrel Shotgun (most likely Masterkey)
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Plz nominate

Good job dude! great info and are all those guns confirmed? If there they are there is alot more guns then CoD4 and thats really good. I really like to change my gun!

Half of this has been written in other posts. But some I didn't know about, good job finding it and thanks.