Cheats:

 1. In the games MAIN MENU, pick OPTIONS
 2. Pick PLAYER NAME
 3. Type out (no spaces) RADARMY and pick END
 4. Pick EXIT from OPTIONS menu to go back to MAIN MENU
 5. Press [Ctrl] + [RightShift] + [8] on the keyboard which will take
    you to the CHEAT MENU.

 Other cheats that might be typed in as player names:

 LIVE FREE    - Invincible
 TOURIST      - Select Level
 GO POSTAL    - Damage bonus, weapons, fast reload
 FOX ROX      - Select level
 GODZILLA     - Kill Civil, kill Wing
 MR HAPPY     - Select plane
 KYRA NR      - all cheats listed up to here together
 BRENDAN QR   - all cheats listed up to here together
 DOOFUS       - all cheats listed up to here together (stop it now !!)
 GREG FM      - all cheats listed up to here together (not again !!)
 SCOTTYWAR    - hmmm ...
 ROSA DUONG   - last one with everything ?

 Can't stand it no more, what might the following do, guess:

 KIWI, COCO, RADARMY, DAB DAB, TRI S