-SAMs can be destroyed by shooting them with any gun, so save the C4 for the bigger tanks.
-After clearing all resistance near the plane and are in a big hall, go up the stairs and you can find some windows. You can see SAMs through the window. It is easy to destroy them from here with grenades or any other desired weapon. Note: After you've destroyed the SAMs from the window and you are about to go forward in the map, place claymore mines in the corridors. If you place all your claymores there (do not set them too close to each other), you will have no problem with the enemy soldiers who are coming from the back.