The objective is to destroy the Target Drones before they can destroy the city of Minsk. You don't need to follow the Weapons System Officer's instructions to use the main gun. Use Stinger missiles to take down the URDs.
Press R during game play, then activate the following cheats by entering the corresponding codes. Note: The cheats only work offline or online in co-ops:
CHEAT FUNCTION - CHEAT CODE Enemy players to start killing each other - 6969 Load the Commanche to the load out specs - loadme Fix damage; does not work after you have been killed - fixme GPS Hellfire; fire and forget - harmony Enemy cannot see you for thirty seconds - imarat Freezes time for everyone except you and co-op friends - imacow 5000 rounds, 99 Stingers, 99 Hellfires, 99 rockets, 99 artillery fire - pigsoink Kill teammate - x666