Choose "Help + Options" in the Main Menu and then choose "Unlock Code."
Enter the following codes for the desired tag. You can add tags in weapon
customization menus. A bell and scream will sound when you enter each code.

Code               Effect

Alienwarec8pestU - Alienware Black Dog tags
Al13nwa4re5acasE - Alienware Symbol
4MDB4quprex      - AMD VISION (blue)
AMD3afrUnap      - AMD VISION (red)
AT1hAqup7Su      - ATi
AUS9eT5edru      - Australian Flag
AUTF6crAS5u      - Austria Flag
BELS7utHAsP      - Belgium Flag
R41nB0wu7p3      - Blacklight and crossed swords
Ch1pBLuS9PR      - Blacklight logo chip
CANfeprUtr5      - Canada Flag
DENdathe8HU      - Denmark Flag
E3F6crAS5u       - E3 Dog Tags
Fam1tsuprusWe2e  - Famitsu dog tag
FINw3uthEfe      - Finland Flag
FRApRUyUT4a      - France Flag
GERtRE4a4eS      - Germany Flag
HOKYeQuKuw3      - Hong Kong Flag
INDs4u8RApr      - India Flag
IRE8ruGejec      - Ireland Flag
ITAQ7Swu9re      - Italian Flag
J4ceH4llstuFaCh4 - Jace Hall Show Logo
JPNj7fazebR      - Japanese Flag
KORpaphA9uK      - Korean Flag
MEX5Usw2YAd      - Mexico Flag
NZLxut32eSA      - New Zealand Flag
NOR3Waga8wa      - Norweigien Flag
Ch1pMMRSc0rp     - Orange Scorpion logo chip
Ch1p0RD3Ru02     - Order logo chip
H4rtBr34kerio4u  - Pink Brass Knuckles
PORQ54aFrEY      - Portugal Flag
R4z3erzu8habuC   - Razer Logo
RUS7rusteXe      - Russia Flag
SINvuS8E2aC      - Singapore Flag
StormLion9rAVaZ2 - Storm Lion Comics Logo - shaped
St0rmLi0nB4qupre - Strom Lion Comics Logo - rectangle
SWEt2aPHutr      - Sweden Flag
SWIsTE8tafU      - Switzerland Flag
TAW8udukUP2      - Taiwan Flag
UKv4D3phed       - United Kingdom Flag
USAM3spudre      - United States Flag
SKULLCLUB9rAVaZ2 - Unkown Effect
Bl4ckl1ght2Ru7uS - Unkown Effect
HOLb8e6UWuh      - Unlock Holland Flag; Tag #132.
                   (Gives a health recharge rate boost!)
ESPChE4At5p      - Unlock Spain Flag; Tag # 139.
                   (Improves the recharge on your HRV slightly!)
UPGr0undv2FUDame - Upper Playground Logo.
UPGr0undWupraf4u - Upper Playground Logo.
Ch1p1GN1u0S      - UTV Lightning Logo chip.
Denek1Ju3aceH7   - Yellow Teddy Bear.
Ch1pZ0MB1Et7     - Zombie Studios logo chip.