You begin on a helicopter. Using the Mark 19 mortars you can attack infantry and vehicles. Wait until your in good position and start the shooting.
First you should deal with anti aircraft positions (#109), that are on the roofs and soldiers equipped with RPGs (#110). If they aren't in the vicinity, concentrate on eliminating the infantry and armoured vehicles. You have to be very careful at all times - it's easy to miss soldiers with RPGs, and they are most dangerous.
After some time the helicopter will land in the middle of the city and will leave few soldiers there. Then you will get some info about another team trapped in the other part of the city. Before you get there, eliminate as many enemies as you can.
Go straight sticking to the building to your left (#111) and killing enemies. You will get to a building (#112), in which your allies are trapped. Go inside and get rid of the terrorists occupying the ground floor. When it's done get upstairs (#113). This is the place where American team is hiding.
The first stage of this rescue mission is finished, now you have to get to the helicopter. Get down and hide behind a container - it will be very hot there, so watch out. Eliminate the soldiers standing on the roof of a high building (#114), and then get rid of the window shooters. After that get inside fast and kill the rest of the opponents.
Leaning out of the window, you can help the rescued team in killing enemies . When the area is clear, get outside and follow the only possible way. When the helicopter lands, get in it (#115). Then put your hands on Mark19.
Just a seconds after you get into the air, the terrorist will bring down the other helicopter. You will have to rescue the pilot that survived. Before you land again (#116), kill every enemy that is in the vicinity.
You have 1m:30secs to rescue the pilot. Don't waste the time on shooting for too long. Just kill the units that stand on your way to the helicopter. Leave the rest of the enemies to your teammates. Go to the crashed helicopter (#117) and get the pilot out of there. Get to your helicopter as quick as possible (#118). The helicopter will take off and you will experience a nuclear explosion.