I have the PC version of this game and need some help with mission 5: Gold Mountain. I have secured the bank and checked out the helicopter crash (and got checks for both of these). I then send all 3 of my squads to the top of the embassy building. A tank comes down the street (but I don't have anti-tank rockets in this mission). However, I get to the top of the embassy well before the tank is close, yet the helicopter is never there to take me out. How do I end this level? The only things left undone are make sure no refugees are killed and get to the extraction point. Thanks in advance.