Fear No Evil
Once in control, drive the tank through the small alley. After 3-3 is taken out, drive through the building and head to the objective marker. Destroy all tanks and enemy troops. Watch the for the next scene.
Walls are nothing
Next, you'll need to defend the allied extraction helicopter. Just take out enemies converging around the area. Remember that those sandbags can be destroyed by continuous gunfire. Keep doing this until you get captured as part of the story. Watch the next scenes, mission complete.