Sorry dude but i beat you to it, i posted that cheatcode way back in the day, don't think i did? go back into the main message boeard for this game it reads CHEAT!!!.
yeah that one was a toughy but i have the perfect strategy:
first change the leaders for the blue team get someone who is good at indirect combat like the guy in the blue trenchcoat the get max as well. and for the red team get the has been black hole guy and and the little kid who can save money when buying things (sorry i cant remember the names right now.)Third deploy. FOurth use the battleship you have and move it to the gulf away from the shores so it cant be attacked by direct fire, attack anything that comes into its range so they cant infeltraite your base. Fifth just keep on buying low price tanks but before that buy infantry units so they can take over cities for more cash-money then whenever you get the chance to use the tanks go north attacking the rockets and anti-air without mercy but do not move the blue team at all untill your red team has destroyed all enemies in the north-west part of the map then use the blue teams rockets to destroy their battleship in the small lake once that is don lead your infantry units for the blue team to the air port you would have saved enough by the n to buy two of those big planes use the planes to destroy all oposing forces. well i hope this gets you started to your path of victory. if anyone has any questions the please write me back on this message board.
If your talking to me did that and failed, honestly you'd think I already knew that.
No here is a more better one though it takes longer and doesn't need campaign!!! You go to survival then do turns, then select which two COs you want to level up. Then complete turn mode, time mode or funds mode. If you earn alot of points in the 11 maps you must do you will get like a 1000 exp for both, keep repeating in the mode over and over again if you can. So when preforming this its a good idea to know what to do (there will be tips if you go to intel or use me because I have completed turn mode). Eventually try turn champion. It has infinite maps so you have to do as many maps as possible.