X-COM - Enemy Unknown

Cheat Codes:
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Submitted by: David K.

Hidden Heroes:
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Change the Name of a Hero to one of the following. This can be done from 
Barrack under View Soldiers, clicking a Soldier, then going to customize.
It can also be done from the customize menu on the deploy screen. 
Note, using one of these heroes will disable achievements.

Code          Effect                   
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Joe Kelly   - Unlock Joe Kelly/ Heavy.
Ken Levine  - Unlock Ken Levine/ Sniper.
Otto Zander - Unlock Otto Zander/ Assault.
Sid Meier   - Unlock Sid Meier/ Support.