Hold Left Shift, then press the “-” key on the keypad.
Operation Flashpoint: Resistance – Cheat Codes Free Download
After that, you can enter the following cheat codes:
iwillbetheone – “god” mode (at any time during the game)
savegame – Save the game (during the mission)
endmission – End the mission (during the mission)
campaign – Access to all missions (in the main menu)
topography – Show elevations on the map (in the main menu)