Operation Flashpoint: Cold War Crisis cheats and cheat codes for PC

Cheat mode:
Hold [Left Shift] and press [-] (keypad minus) at the indicated screen. 
Release the keys, then enter any of the following cheat codes:

Code - Screen - Effect
iwillbetheone - Any - Activate God mode
savegame - Game play - Saves game
endmission - Game play - Finish current mission
campaign - Main menu - Unlock all missions
topography - Main menu - Display elevations on map

Bonus level:
Finish the game with the best ending and watch the entire credits.
An intermission sequence will begin. 

Christmas theme:
Modify the system date to December 25 the start the game. 
All of the pine trees replaced with Christmas trees.

Invincibility:
Before the end of the stage, just when the helicopter picks you up, wait 
about 5 seconds. Press ] or [ to go to your action menu and choose "Eject". 
Hit Enter to parachute out of the helicopter. When your character lands, 
you can continue the game in invincibile mode. Note: Works only in demo mode.