Spec Ops: Rangers Lead the Way

Spec Ops: Rangers Lead the Way cheat codes: 
Invincibility and Reset Mission Time:
To become invulnerable, press ALT+SHIFT+V
and access your inventory. You will have
the viewmaster. Use it an the screen will
flash blue, your ranger will jump and the
time will reset giving you the time that
the mission started with.

Level Select:
To gain access to all missions you will have
to move the Savedata.txt file out of the Spec
Ops directory.

Training Mode:

To enter training mode go to any level.
When the level starts press the "t" key.
This code allows you to travel the level
without being timed.