 | Select Multiplayer->Online Game from the main menu. |
 | After passing the agreement and loading screens, select Options->Soldier Loadout from the Online Game menu. |
 | Bring up the Unlock Code keypad by pressing start on the Loadout screen. |
 | Type in your 16 digit code, the 4 blocks of 4 characters can be seperated by spaces or dashes. (You can also use a USB keyboard.) |
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 | Success! You can now select the item(s) you've unlocked for your character loadout. Press the O button to save & exit. |