Call of Duty: Modern Warfare 3 - Little Bros

In the first area, slowly clear the area of enemies up to the spot on the left with green smoke. Once the helicopter lands, get on. The helicopter will take you to a nearby building, once the helicopter is close enough, jump off and proceed towards the enemies straightforward. Continue down the staircase where they are coming from and kill any enemies in sight. Once you have gone down the staircase, go Northwest towards the destroyed part of the building and work your way downwards, and fight off the incoming soldiers. When the area is clear enough, arm the bomb then proceed South towards the rendezvous for extraction. As soon as possible, get back into the helicopter to complete the mission.