Weapon tags:
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At the main menu, select "Help + Options", and choose the "Unlock Code"
selection. Then, enter one of the following case-sensitive codes to
activate the corresponding weapon tag to use through the "Armory Weapon
Customization" option. If you entered the code correctly, you will hear
a bell followed by a woman screaming.

Result              Code
----------------------------------------------
Alienware black dog tags                      Alienwarec8pestU
Alienware symbol                          Al13nwa4re5acasE
AMD VISION square tag (blue)            4MDB4quprex
AMD VISION square tag (red)              AMD3afrUnap
ATi square tag                   AT1hAqup7Su
Blacklight and crossed swords                   R41nB0wu7p3
Blacklight logo chip                Ch1pBLuS9PR
E3 dog tags                   E3F6crAS5u
Famitsu Magazine dog tag             Fam1tsuprusWe2e
Jace Hall Show logo                  J4ceH4llstuFaCh4
Orange Scorpion logo chip                 Ch1pMMRSc0rp
Order logo chip                   Ch1p0RD3Ru02
Pink brass knuckles               H4rtBr34kerio4u
Razer logo                  R4z3erzu8habuC
Upper Playground logo              UPGr0undv2FUDame
Upper Playground logo                   UPGr0undWupraf4u
UTV Lightning logo chip                Ch1p1GN1u0S
Yellow teddy bear             Denek1Ju3aceH7
Zombie Studios logo chip          Ch1pZ0MB1Et7
Australian flag            AUS9eT5edru
Austrian flag            AUTF6crAS5u
Belgium flag             BELS7utHAsP
Canadian flag             CANfeprUtr5
Danish flag             DENdathe8HU
Finnish flag            FINw3uthEfe
French flag         FRApRUyUT4a
German flag           GERtRE4a4eS
Hong Kong flag         HOKYeQuKuw3
Indian flag              INDs4u8RApr
Irish flag             IRE8ruGejec
Italian flag             ITAQ7Swu9re
Japanese flag                  JPNj7fazebR
Korean flag                   KORpaphA9uK
Mexican flag              MEX5Usw2YAd
New Zealand flag                  NZLxut32eSA
Norwegian flag               NOR3Waga8wa
Portuguese flag                 PORQ54aFrEY
Russian flag                 RUS7rusteXe
Singaporean flag            SINvuS8E2aC
Swedish flag           SWEt2aPHutr
Swiss flag            SWIsTE8tafU
Taiwanese flag            TAW8udukUP2
United Kingdom flag               UKv4D3phed
United States flag           USAM3spudre