Grommett

I'm running a 7970 with an i7 and 16Gb RAM getting a stable 40+ frames. Few things to do: -As always, Make sure you're running the latest drivers for your card -Turn down Anti-aliasing (2x or 4x is enough) -Turn down your view distance (This will take tweaking to meet a good view > Good FPS ratio) If you're still not getting good frames you may need to optimize settings in the CCC (Catalyst Control Center) such as: "Performance - Quality" sliders, Ensuring the program controls how AA is dealt with rather than CCC. If all that fails you may be able to squeeze some extra frames with a slight overclock (There are dozens of guides for this) and don't forget to turn the fan speed up.

With this mission, When pressing the 0-8 key it will bring up that dialogue box - I couldn't find anything under support either, However under another option (The name escapes me at the moment it was the second last) it will have the mortar and helicopter support options available for use. Hope this helps.