Players looking to customize Master Chief's appearance in Halo: Campaign Evolved have several opportunities to acquire free armor sets through various promotions and redemption codes. These cosmetic additions allow for personalization beyond the default Mjolnir Mark V armor, which itself can be swapped for different skins accessible from the main menu.

To redeem these cosmetic DLC items, players must visit the Halo Waypoint website and sign in with their Microsoft account. From there, navigating to the "Drops & Code Redemption" section allows for code entry. Once redeemed, the DLC will automatically apply to the player's copy of Halo: Campaign Evolved upon their next login, and can be accessed under the "Customization" option in the main menu.

Two armor sets are currently available via direct code redemption. The Sandstone Ancient armor set was initially offered as an apology for launch day issues with the early access version of the game. Its redemption code is L563-J46G-PZN1-SBF2-AXN6. The Damascus Prototype armor, celebrating Xbox's 25th anniversary, features a translucent finish and can be obtained with the code GWT9-DNBT-7X9S-DJCX-8KH3.

Further cosmetic options are accessible through platform-specific events. To acquire the Hidden Blade armor set, players need a Discord account and must visit the "Quests" tab within the app to watch a trailer for Campaign Evolved. This action will generate a unique code for redemption on Halo Waypoint. The Stream of the Crop armor set requires a more involved process: players must watch two hours of an eligible Halo: Campaign Evolved stream on Twitch that has Drops enabled. These streams can be found on the official Halo Twitch homepage. After earning the Twitch Drop, it must be claimed from the Twitch Drops Inventory. Crucially, players must link their Twitch account to their Halo Waypoint account before claiming these rewards.

An additional armor set, the Fantastic Spartan Armor, is available through a promotion with Fanta. Consumers can purchase Fanta products bearing the Xbox25 logo, which will contain a QR code. Scanning this code directs users to set up a Coca-Cola account and participate in one of three Rewards Chest Challenges. Upon completion, players can select the Fantastic Spartan Armor as their reward, and a download code will be emailed to them for redemption on Halo Waypoint.

For players seeking more content or assistance within Halo: Campaign Evolved, additional guides are available, detailing the locations of game-modifying Skulls and instructions on how to unlock a secret ending that hints at a potential Halo 2 remake.