Chang-san Air Base Armory in MW4 DMZ: How to Get In
The Chang-san Air Base armory is underground, in the Air Base Bunker (Extreme threat). Its door needs the Airbase Armory Keycard - Single Use, which you get during the Operation Iron Citadel Story Mission and can use once. The bunker has more locked rooms, each with its own key.
Last updated Game version: Launch (October 23, 2026)
Where the Chang-san Air Base armory is
Chang-san Air Base, in Western Hajin, is a heavily guarded North Korean air base built into a granite hillside, with an underground bunker complex that is larger than the base on the surface. The armory is not in the buildings on the surface: it is down in the Air Base Bunker, whose large doors are set into the hillside on the south side of the base.
- Air Base Exterior: Critical
- Air Base Bunker: Extreme
- The key card's description names grid B5 on the Tac-Map.
See the base on the interactive Hajin map, or read the Chang-san Air Base location guide for the rest of the base and how players get in.
How to open the armory
The card that opens it is the Airbase Armory Keycard - Single Use (Legendary). 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.
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.
The Operation Iron Citadel steps:
- Find the access card in one of the buildings the mission marks
- Upgrade the access card at a terminal
- Get into the armory and clear it
- Plant explosives on the 3 strike aircraft
- Exfil to finish the mission
Rewards: Supreme Leader's Bunker Access Card, LTV (Paid Infil), 25,000 DMZ Cash. The full mission, with where it starts, is on our Operation Iron Citadel page. Finishing it also ticks off one of the DMZ Orders, in the Hornet's Nest chapter of our DMZ Orders checklist.
Every locked door at Chang-san Air Base
| Key | What it opens |
|---|---|
| Supreme Leader's Bunker Access Card | The Supreme Leader's Bunker, deep in the Chang-san Air Base Bunker. A reward for the Operation Iron Citadel Story Mission. |
| Air Base DRC Weapons Locker (B6) | The DRC Weapons Locker in the secure armory deep in the air base's bunker. |
| Airbase Armory Keycard - Single Use (B5) | The armory in the Chang-san Air Base Bunker, whose door reads "Requires Air Base Armory Access Card". The card says it works once. 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. |
| Weapons Mod Workshop (B5) | A weapons workshop at Chang-san Air Base. |
| Air Base Access Card - Multi Use (B5) | Locked doors around Chang-san Air Base. Unlike the armory card, it can be used more than once. Found during the Operation Iron Citadel Story Mission. The upgrade terminal at Admin Complex No. 2 turns it into the single-use Airbase Armory Keycard. |
| Commandant Office (B5) | The commandant's office on the second floor of Admin Complex No. 2. |
| Field Depot - B5 (B5) | The Field Depot door at Chang-san Air Base, in the area the Tac Map labels Field Depot. |
Every key players have found in Hajin, with a checklist of the ones you have, is in our MW4 DMZ key finder.
Before you go down
- The bunker is Extreme threat. Bring your best armor, and keep what you cannot lose in a Secure Slot.
- Dying there costs more than your gear: the Operator goes MIA. What a rescue costs is in our MW4 DMZ MIA Operators guide.
- The enemies at each threat level are in our DMZ threat levels guide.
Questions
Where is the armory at Chang-san Air Base in MW4 DMZ?
Underground, in the Air Base Bunker under the hill on the south side of the base (grid B5). The threat level down there is Extreme.
How do you open the Chang-san Air Base armory?
With the Airbase Armory Keycard - Single Use. 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 other locked rooms are at Chang-san Air Base?
The Supreme Leader's Bunker Access Card opens the Supreme Leader's Bunker, deep in the Chang-san Air Base Bunker. The Air Base DRC Weapons Locker opens the DRC Weapons Locker in the secure armory deep in the air base's bunker. The Weapons Mod Workshop opens a weapons workshop at Chang-san Air Base. The Air Base Access Card - Multi Use opens locked doors around Chang-san Air Base. Unlike the armory card, it can be used more than once. The Commandant Office opens the commandant's office on the second floor of Admin Complex No. 2. The Field Depot - B5 opens the Field Depot door at Chang-san Air Base, in the area the Tac Map labels Field Depot.
Is Chang-san Air Base dangerous?
It is one of the most guarded places in Hajin: Air Base Exterior is Critical and the Air Base Bunker Extreme. Chang-san Air Base is a heavily guarded North Korean air base built into a granite hillside, with an underground bunker complex that is larger than the base on the surface.
Official sources
Continue reading
Next stepGoing after more keys? See every key players have found and tick off the ones you have.MW4 DMZ Keys: Locations and Locked RoomsEvery confirmed DMZ key: where it is, its Tac-Map grid square, which door it opens and what players found inside.Go there Related guides
EnemiesDMZ Threat Levels, Enemies and BossesThe five threat levels, every enemy type named so far, the Lieutenants and Commanders on the Boss Board, and which places start at Extreme.
OperatorsMW4 DMZ MIA Operators: Rescue Cost and InsuranceWhat happens when an Operator goes MIA, what a rescue costs as the Dog Tag levels up, and the Rescue Beacons and Weapon Insurance Contracts that soften it.
Dynamic OpsCheongun Outskirts Access Code in MW4 DMZWhy there is no fixed Cheongun Outskirts access code, where to read yours in the Viral Reckoning objective, where the keypad door is and the other codes players share.