Armory Credits are a type of currency in Call of Duty: WWII. It is earned by Social Score ranks, completing daily orders, earning them in supply drops, converting duplicated supply drop items and through the daily rewards. Armory Credits are used to purchase items in collections or contracts from the Quartermaster.
Specifically, 200 Armory Credits are earned via the Mailbox in the Headquarters.
Armory Credits are given multiple qualities, most often appearing in a Common quality. The amount of Armory Credits found in a supply drop determines the quality of the card. Armory Credits are also given as a bonus item in Rare Supply Drops, which stacks with any amount of Armory Credits unlocked in a supply drop.