Call of Duty 4: Modern Warfare/No Fighting in the War Room

Objectives

 * Get to the launch control room
 * Plant the C4 on the wall to the launch control room
 * Upload the abort codes
 * Follow Captain Price

Get to the launch control room
Once you start the mission, follow Captain Price to the air ducts.

After you get out, head to the right, there will be two enemies coming out from a doorway, kill them then wait and a second will come out. Kill them all then go through the doorway, pick up an AK-47 on the way as it will come in useful. Look through the doorway to the right and pick off all the enemies, some more should come, kill them as well then slowly head down the corridor with sights up, picking out any enemies that you see.