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Spec Ops Cheats
PC | Submitted by marcusInvulnerability
To become invulnerable, press ALT+SHIFT+V and access your inventory. You will now have the Viewmaster. Use it and the screen will flash blue, your ranger will jump and the mission time will reset.
PC | Submitted by ananymusNo Time Limit
Type the letter "T". This is called traaining mode, but allows you to fully complete the missions without a time limit.
PC | Submitted by marcusAll Levels
To gain access to all missions: Just move the Savedata.txt file out of the Spec Ops directory.