Chang-san Air Base on a hillside in MW4 DMZ, with a helipad, control tower and barracks — Screenshot: Call of Duty: Modern Warfare 4 © Activision (enhanced)

MW4 DMZ key · Chang-san Air Base

Airbase Armory Keycard - Single Use in MW4 DMZ

The Airbase Armory Keycard - Single Use opens the armory in the Chang-san Air Base Bunker, whose door reads "Requires Air Base Armory Access Card". The card says it works once. Its description names grid B5, at Chang-san Air Base. In the Operation Iron Citadel Story Mission: upgrading the access card at Admin Complex No. 2 gives you this card, and the mission then sends you into the armory.How to get the key

Last updated October 23, 2026Game version: DMZ Early Access, day 3

◆ Fortress · ■ Compound · U UAV Tower · A Ammo Armor Cache · P Police Station · F Fire Station · C Clinic · G Gas Station. Rings show the highest threat level (Low, Medium, High, Critical, Extreme); the white ring is Chang-san Air Base. Smaller markers from Activision's official Hajin Tac Map. Screenshot: Call of Duty: Modern Warfare 4 © Activision (enhanced)

Where the Airbase Armory Keycard - Single Use is

Location	Chang-san Air Base
Tac-Map grid	B5
Rarity	Legendary
Highest threat at Chang-san Air Base	Extreme

The Tac-Map grid runs letters from west to east and numbers from north to south, so B5 is column B, row 5. See Chang-san Air Base on the interactive Hajin map, and its threat level by area in our Chang-san Air Base location guide.

What the Airbase Armory Keycard - Single Use opens

The armory in the Chang-san Air Base Bunker, whose door reads "Requires Air Base Armory Access Card". The card says it works once. The key card is Legendary.

Confirmed by 2 sources. Checked 2026-10-23 (DMZ Early Access, day 3).

How to get the Airbase Armory Keycard - Single Use

In the Operation Iron Citadel Story Mission: upgrading the access card at Admin Complex No. 2 gives you this card, and the mission then sends you into the armory.

Keys can go in your Stash between deployments, but anything outside a Secure Slot is lost if your exfil fails. Tick the keys you have in the MW4 DMZ key finder; the list stays in your browser.

Other keys at Chang-san Air Base

Supreme Leader's Bunker Access Card: The Supreme Leader's Bunker, deep in the Chang-san Air Base Bunker.
Weapons Mod Workshop (grid B5): A weapons workshop at Chang-san Air Base.
Air Base DRC Weapons Locker (grid B6): The DRC Weapons Locker in the secure armory deep in the air base's bunker. One source so far, not yet verified.

Questions

Where is the Airbase Armory Keycard - Single Use used in MW4 DMZ?

At Chang-san Air Base, grid B5 on the Tac-Map. It opens the armory in the Chang-san Air Base Bunker, whose door reads "Requires Air Base Armory Access Card". The card says it works once.

How do you get the Airbase Armory Keycard - Single Use?

In the Operation Iron Citadel Story Mission: upgrading the access card at Admin Complex No. 2 gives you this card, and the mission then sends you into the armory.

What rarity is the Airbase Armory Keycard - Single Use?

Legendary, as its key card shows.

Every confirmed MW4 DMZ key with its own page

Sources

Checked against the official posts on October 23, 2026. The key itself comes from players’ videos, linked above at the moment they show it; we only give a key its own page once two different sources agree.