This guide lists all keys that can be found in Modern Warfare 4's DMZ mode and where to use them.
Game Rant on MSN
MW4 DMZ: X01 cargo bay keypad puzzle
The Cargo Bay area has a 4-digit keypad that contains a secret loot room, so if you want to know the password, you can find it right here.
Some results have been hidden because they may be inaccessible to you
Show inaccessible results