Call of Duty 4: Modern Warfare/All In

Objectives

 * Gain access to the launch facility
 * Destroy all enemy armor
 * Cover yuor squad while the air vents are breached

Destroy the BMP
For the first part of the mission, you need to destroy a BMP tank. You can either do this by using two RPGs or getting up close to the tank and plating a C4 on it.

The best way to take out this tank is to go down the street to the left, there will be a truck with 3 RPGs near it, swap these for your secondary weapon. There will be a C4 symbol on the wall, put a C4 here and go through it. shoot any enemies you see in the back and any that try to cover behind the containers. There will also be 1 proning in the snow, shoot him then when the tank gets close, shoot it with the 2 RPGs.

Gain access to the launch facility
Now, even though you are meant to to go right, it is best to go left. First either pick up an AK-47 Grenadier from a small room ahead of you or a G36C from the right of the first dome shaped building, Go forward and kill all the enemies using the grenade launcher and your guns then go up the stairs, by this time your allies will have made it to the courtyard.

You will find a Javelin missile launcher at the top of the stairway, use this to take out the two tanks, fire diagonally so you have room from the top of the staircase. If you need to, pick up the Dragunov and snipe a few enemies first if they are causing you trouble. After both tanks are destroyed, pick up a good weapon and head over to the grate, rappel in after it is cut open and the level is finished.