Plot

You will play as Mason and Hudson.

SOG

The Defector

Numbers

Project Nova

Victor Charlie

Executive Order

Crash Site

WMD

Payback

Rebirth

Redemption

Characters

Frank Woods - Member of the Studies and Observation Group

Hudson - Playable character and a member of SOG.

Mason - Playable character and a member of SOG.

Reznov - Returning from Call of Duty: World at War and a member of SOG.

Thomas - Playable character and the pilot of the SR-71 Blackbird in "WMD".

Weaver - Character in "WMD".

Swift - Character in "Victor Charlie".

Brooks - Character in "WMD".

Harris - Character in "WMD".

Kravtchenko - Antagonist conducting a black operation in Laos.

Bowman - Member of SOG.

Lancer

Clarke - Member of SOG.

Campaigns

SOG

In the beginning of the level, Jason Hudson informs the player that Woods is here. The player will then go outside the bunker and sees Woods coming out of a helicopter. Woods has scars and stains of blood and mud on him. He then takes the player on a ride and informs the player of how MACV SOG was made. From there the interactive part of the level starts. The player finds himself in the thick of the jungle fighting Viet Cong. One section involves the player crawling along trenches with enemy flamethrowers blazing overhead (similar to the scene in Call of Duty: World at War, where Reznov and Dimitri escape German flamethrowers in a collapsing building). It has been confirmed that you have to assassinate a high profile world leader.

The Defecter

In this level Mason is being interrogated in a dark room lined with monitors. There's also a strange drug being fed into his bloodstream via needle. The entire game is based around Mason in this room having flashbacks to the various military operations he participated in. This interrogation room is seen at the beginning of the teaser trailer, by the dialog it seems that the interrogators are trying to get Mason to remember the experiences ("this will help you to remember everything, and maybe something extra to assist").

 Numbers

The level takes place in Kowloon, Hong Kong . It involves torturing a prisoner as Mason, along with Hudson, Weaver and Clarke, something the player does himself with context-sensitive commands. When torturing the prisoner, Mason will smash a glass window, then place a shard in the mouth of the prisoner, punching his jaw several times.
After the torture scene, the North Vietnamese Army and Spetsnaz discover their positions and the player will have to jump over rooftops from them. 
 

Project Nova

This a single player level in Call of Duty: Black Ops. The main objective in this level is to destroy the biological weapon, codenamed Nova-6.

Victor Charlie

Victor Charlie is a planned mission for the upcoming game Call of Duty: Black Ops. 

Executive Order

Executive Order is a single player level in Call of Duty: Black Ops. The mission takes place in and around the Pentagon. 

Crash Site

Crash Site is a single player level in Call of Duty: Black Ops. In the Reveal Trailer, a helicopter can be seen crashing in Hue City, Vietnam. From the revealed achievements, it is known that the "Slaughterhouse" campaign mission was renamed. It is most likely that this mission was Slaughterhouse since it took place in Hue City and that there was a "Crash Site" there.

 Mason starts off in a Huey helicopter, preparing to rappel into the city with the objective of securing a CIA headquarters which has been overrun by the North Vietnamese Army. While rappelling from the helicopter, it is shot down by enemy fire. Still clinging to the rope, Mason and his squad-mate, Woods, are able to smash through a window of a multi-story building. Dazed by those events, he rises to his feet and is given a SPAS shotgun equipped with Dragon's Breath ammunition by Woods. Making their way to the objective, Mason and Woods encounters several Vietnamese troops, all of which are set aflame by the player's Dragon's Breath ammunition.

Receiving assistance from friendly choppers, machine guns rain fire through windows quickly eliminating any enemies caught in the fire. Intensity is high, and mixing in civilians throughout the building requires quick thoughts and reactions by the player to minimize their casualties.

Once the player has made his way into the urban streets, a Vietnamese soldier can be heard over a loudspeaker system: "American soldiers, put down your weapons! This is not your war. We do not wish you harm."

Outside, Mason approaches a group of Marines and takes over their radio transmitters. Requesting assistance from the sky, he is then tasked with the job of designating buildings to be fired upon by the helicopters. While fighting through the streets, the player is able to provide reconnaissance to the choppers who soften enemy resistance. Later on in the level, the player is tasked with escorting an APC named "Bottom Feeder" through the city streets. The preview ends with the player fighting off Vietnamese soldiers on the streets.

WMD

WMD is a planned mission in Call of Duty: Black Ops set in the Ural Mountains where SOG is told to find codename Nova-6.

The player (as Thomas) is approaching an SR-71 Blackbird reconnaissance aircraft which sits on a runway in a California Airbase. After approaching the vehicle, Thomas is saluted and begins to board the plane. After requesting for takeoff, the player is told "Your aircraft sir". The pilot (the player) is then prompted to press a control to engage the boosters, then must pull back on the thumb-stick (or equivalent) to begin the ascent. After a short cinematic of Big Eye 6 in orbit, the screen cuts to a first person view of the cockpit.

The view is that of a thermal screen where the four man team (Kilo 1 - SOG) can be seen prone in the snow. Thomas' job is to assist them passing enemy patrols. After providing them with reconnaissance, the screen fades, and the player assumes control of Hudson, one of the members of the SOG squad below. Throughout the beginning of the level the view switches between characters as the squad approaches enemies.

The player lies prone in the snow with his squad-mates on his flanks, with his crossbow. Power lines can be seen in the distance. Heavy breathing can be heard. At that moment, a group of Russian soldiers on patrol slowly creep by north. Luckily, the squad is not detected and the troops continue on their path.

The objective is to make way to a sub station. The point of interest is that of a weapons manufacturing facility. Making their way down the snowy trails, SOG is met by their first enemies. Shouldering the crossbow, the player picks off any targets while remaining completely silent. Continuing further down, the player is then required to hook up and rappel down the steep face of a mountain. After hooking up their ropes and beginning their descent, the player is required to manually rappel down the cliff face. Rappelling a second time and shooting through the facility's windows with suppressed AUG prototype rifles, SOG is immediately met by a horde of Russian soldiers. Once the substation is taken, the objective is updated and the player is required to move to the "com-stat".

Going further down the mountain, SOG soon meets a group of enemies that require a bit more firepower. Switching over to explosive tips on the modified crossbow, the enemies are quickly eliminated. After taking out the enemy troops and taking the storage shed, the player moves onto the power room.

Alarms are sounding, enemy chatter can be heard. Switching to an assault rifle, the player heads towards the power room. Moving behind their teammate, he opens a door and is immediately faced with an enemy, resulting in the teammate killing the enemy with a throwing knife, in the neck. Making headway through the facility, the opposition is heavy. Chaos ensues, but only shortly as the player and his teammate quickly kill the enemies inside the facility. Moving to the objective, the player finds the relay and yanks the fuses from the box, rendering the station useless.

Once the SOG have cleared the mountain and completed the objective, jumping across opening crevices pursues, and the player follows the team to what is hoped to be safety, before a Russian troop fires an RPG at the bridge, killing Brooks after falling off the bridge. Then again, another is at the face of the cliff, resulting in a large avalanche. As the snow rushes behind, the SOG team have no choice but to jump.

Payback

Payback is a single player level in the upcoming game Call of Duty: Black Ops set in Laos. In this mission, the player will operate a Mi-24 Hind.[2] Although the player has full control of horizontal movement, they cannot control vertical movement. It has been stated that there will be no tutorial on how to control the helicopter.

It has been mentioned that this mission continues after the player and Woods have escaped from a prison. The player is given a Commando with a grenade launcher, and will have to steal a Hind from a Russian encampment. After the player kills them, they will climb into the cockpit with Frank, who will assist the player as the gunner. Then, the player will provide top cover for a squad on the ground through heavily occupied enemy territory. The player will engage other helicopters. Frank will assist the player using the Hind's gunner seat and the squad on the ground will help take out RPGs.

Rebirth

Rebirth is a single player level in Call of Duty: Black Ops. It appears to take a place in a lab, as one of achievements lists a "Rebirth Lab" and "Rebirth Island".  

Redemption

Redemption is a single player level in Call of Duty: Black Ops.