A walkthrough for Call of Duty : Black Ops – WMD
by Kenneth Stubbs (OmegaMustard)

WMD
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You will board a plane.  It will take off and now you will be in control
of a thermal navigation point system of your squad.  They want you to
direct them.  First thing you will see is a truck drive point.  Alert
them to it’s presence.  Now you will have a marker on the map to the right,
make them go to that point and immediately send them into the safe house.
You will see an enemy squad drive by but then one decides to drive up to
the house.  You will now be in control of a soldier.  Take out the enemy
squad and you will be back in control of the ship.  Move the squad out
the back door of the house and target the two enemies out the back.  Now
move them to the road.  While they are moving to the road, youu will be
notified of a large enemies squad, quickly press the on screen button
for your team to dig in.  After the enemies pass by, move your squad to
the barracks.  The will stack up and you will take control of one of
them again.  Breach the door and take out the enemies inside.  Once you
enter and go down the little set of stairs.

Intel – There will be a piece of intel on the table to your left.

Blow the computer circuit boards with C4 and you will then be back in
charge of the pilot.  Move the squad north twice and this will end a piece
of the level.

You are now in control of a soldier in the squad.  You will be laying in
the snow and an enemy squad will walk by.  Get up it prompts you to and
move towards the house.  A guard with a dog will walk out, so go prone
and wait for them to run off.  Now make your way to the house and sneak
around it. Make your way to the railing looking over the mountain.  You
have to rappel here.  Follow the onscreen instructions to rappel down.
Don’t rappel too much in one jump without braking or you will fall to
your death.  When you reach the bottom, get ready to rappel breach the
building underneath you.  You will jump through the window, take out all
enemies in here.  Now make your way through the back door and down the
stairs.  Make your way through the snow.  Go slowly around the bend
leading to the left because there are two guys patrolling here.  Wait for
your squad to move up and take one out.  Your squad will take the other
out.  Now move up.  You team will say there is a large squad of enemies
up ahead. Move up slowly.  Take out the guy in front of the garage with
the cross bow once the guys in the garage start working on the bulldozer.
After you have killed the guy walking, shoot one of the guys in the
garage and your team mate will take out the other.  Move up and look to
the right.  You will see two guys working on a truck.  Pick one and take
him out so your team mate will take out the other. Move up to the two guys
shoveling snow.  Pick one and take him out and your team mate will take
out the other.  Move around the mountain and shoot the guy standing on
top of the base.  Now a guy will walk around the bulldozer, wait for him
to get closer to you and take him out.  Now zoom in and take out the guy
straightening up guns in the base.  Move up past the base and right at
the catwalk.  A guy will walk around, shoot him and you’ll get an
achievement/trophy for getting in undetected. Make your way down the cat
walk and shoot the hinges off the door.  Enter and your squad mate will
kill an enemy with a knife.  Continue to the next door and kick it open.
Don’t worry about killing the guys in front of the window, your team
will jump through the window and do that.  Just concentrate on the
guys on the first floor.  Take them out and three guys will run through
the door on the other side of the room. 

Intel – Run in that room and pick the intel up off the left. 

Now kill the new enemies that spawn on the lower level.  After you take
a few out, guys will run out the top floor where you came in at.  After
taking them out, your squad will say clear and you will now have to destroy
the satellite controls. Go to the control box and you will destroy them.
Now follow your team out on the catwalk. You will get hit with a rocket
launcher destroying the catwalk and you lose a team mate.  Run and jump
across and follow your team through the avalanche.  Jump when you get to
the end and hold forward while you fall down.  Activate your parachute
when it prompts you to. You will hit the ground and now you have to take
care of the guys in front of you.  Just pick a target and shoot and they
will attack.  Take them out, once a few are taken out and you move up you
will be attacked by a MG turret.  Run in the building on the right side
and kill the enemies in this first room.  Move into the slightly burning
room and kill the three guys on the right.  Make your way down the right
and out the door on the left.  Go across the open spot and into the next
building. 

Intel – Grab it off the table in the middle of the room.  Right side table.
        Before going into the projection room.

Go into the projection room and You will watch some story information and
then you must escape in three minutes. A bunch of enemies will run in, make
your way out the left door and hide behind the barrels and slowly take out
the enemies.  The enemies will start retreating after you kill a few and
your team will run up.  Run up to the big doors and kill the rest of the
enemies that ran outside.  After they are dead, run up to the back of the
truck that the marker is on.  You will board the turret and you must keep
the enemies back will they hotwire the truck.  Shoot the trucks so they
blow up and watch for a guy on the left with a rocket launcher.  After you
have killed a few, the truck will drive off and this ends the level.

Source :The Call Of Duty Black Ops Walktrough FAQ