Operation Flashpoint: Resistance

Operation Flashpoint: Resistance cheat codes: 
Hold [Left Shift] and press [Keypad Minus] at the indicated screen.
Release the keys, then type one of the following codes.

Result                   Screen     Code
God mode                 Any         iwillbetheone
Saves game               Game play   savegame
End current mission      Game play   endmission
All missions unlocked    Main menu   campaign
Show elevations on map   Main menu   topography