Hi. I have reached the level on VIP 2 where you have to take out the Anti Aircraft Rocket Launchers by ordering up air strike but i cant get it to work. In the Hud i have my ghosts the airstrike. I can operate the ghosts on buttons 1,2,3, etc but when i try to press 4 or any other button for calling airstrike nothing happens. Any ideas would be much appreciated.