Here are some cheats and tips for the game Spec Ops.
Cheat mode:
Press “Alt + Shift + V” during a mission, display the items screen,
then select and use the “Viewmaster”. The screen will flash blue to
confirm correct code entry. The timer will reset to 9:59 and your
ranger will be invincible.
Training mission:
Press “T” when a mission begins to play without the timer.