I am stuck on the helicopter mission where you attack the fuel convoy...

In order to pass this level you should click the right analog stic. It helps you see where the enemy's are. The enemy appears red and much easier to pass the level than trying to see it on your own. Leave it on the whole time it makes the mission fun.

Try going on the left side of the convoys at the last part of hijacking and as the other pending post said use thermal.

I can't seem to controll the helo can not get it to gain altitude going through the canyon.

I can't get the heli low enough to get through the tunnel :L

It also helps to pass this part is to use the rockets with left trigger. And use them one by one so no salvo. And fly to the edge of the battlefield. These few seconds help you to survive just enough to wear down the enemy.
Good luck!!

I cannot get the helicopter low enough to go through the tunnel... The "decend" button does not work... The helicopter will just run into the mountain :/ any suggestions?

What kind of stupid crap is this. The descend button does not work? How hard is it to make the freaking helicopter descend? Please fix this mess

I ad the same problem with the heli not descending. Once I unplugged my joystick, it worked.

I did the same thing I unplugged my joy stick but it still didn`t work I completeley stuck somebody help and solve this problem

The chopper has countermeasures, "X" launches flares, do this every few seconds, it decoys missles enough to let you get close and finish off the LAV's