To claim reward you must have an accounts at PawnTakesPawn and Call of Duty.
Go to the Subterranean Signal quest page. There you will see a table for entering code words:
Next, from left to right, enter:
After you have entered the codes, you will be redirect to a page with a message that the quest has been successfully completed.
If you did everything correctly, the next time you enter the game the new items should be in your inventory.
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