I didn't make it!
I have problem in the level "The Shop Roof". I can't shoot down the halicopter (vertical start plane). The helicopter is flying around the roof and it is undestroyable. I'm supposed to kill a man in it and the level should end.
Is it more clear?
Shoot the engines till they catch fire just like you did before. In this level there is a mounted M60 Machine Gun on the roof which is perfect for this, though any rifle will work. Also in this level there is a weapons storage locker which you can get to by picking the lock on the door.
After the engines are on fire, you need to shoot the pilot.
After you do, the level will end so grab a fresh box of hankies and congratulate yourself on job well done. Oh, BTW, thanks for saving the world from the bad guys. As a token of our gratitude, a small pittance will be automatically deposited in your personal account. But after we deduct your expenses, take out taxes, and your ex-wife and kids get the rest; you may have to get a job at the Prague Hotel to make your Humvee payments.
Yea or go to http://www.sof2files.com and download the guide :D