Come outside and kill a few enemies, follow the ruined path to the

Meet your teammate in the school, follow him to the rendezvous location
Red smoke bombs here is, sprint past into the Humvee, use the machine gun on the car to kill all the enemies around, and keep holding on until friendly planes come to the rescue when the enemy is almost dead and blown up by an RPG, climb up and run to the rear of the plane to evacuate the battlefield.