MW4 DMZ Story Mission · Chang-san Air Base
Operation Iron Citadel Walkthrough in MW4 DMZ
Operation Iron Citadel is a Story Mission at Chang-san Air Base with 5 objectives, all listed below in order. It pays Supreme Leader's Bunker Access Card, LTV (Paid Infil) and 25,000 DMZ Cash.
Last updated Game version: DMZ Early Access, day 2
Objectives
- 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
Confirmed by 2 sources: video 1 at 0:22, video 2 at 13:02. Checked 2026-10-21 (DMZ Early Access, day 2).
Before you go
Threat assessment Critical; recommended gear: a 3-Plate Armor Vest, a Medkit and an Ammo Box. The base is run by Lieutenant Bae. The mission screen lists three objectives: Infiltrate the Base, Recon Armory Ordnance and Disrupt the Operation. Expect a Colossus commander here.
Rewards
- Supreme Leader's Bunker Access Card: where it is used and what players found behind the door
- LTV (Paid Infil): see every DMZ vehicle and what a Paid Infil costs
- 25,000 DMZ Cash
Where Operation Iron Citadel takes place
Operation Iron Citadel runs at Chang-san Air Base, where the highest threat level listed is Extreme. See it on the interactive Hajin map; our Chang-san Air Base location guide has the threat level of each area and the keys whose doors are there.
When it unlocks
It opens once you have finished Operation Critical Extraction, Operation Silent Ledger and Operation Shopping Hacks, together with Operation Grid Assault. Only one squad in a match can run a given Story Mission, but other squads can still come after you there. You can replay Story Missions.
Questions
Where is Operation Iron Citadel in MW4 DMZ?
At Chang-san Air Base, where the highest threat level listed is Extreme.
How do you complete Operation Iron Citadel?
Finish its 5 objectives in order: 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.
What does Operation Iron Citadel reward?
Supreme Leader's Bunker Access Card, LTV (Paid Infil) and 25,000 DMZ Cash.
When does Operation Iron Citadel unlock?
It opens once you have finished Operation Critical Extraction, Operation Silent Ledger and Operation Shopping Hacks, together with Operation Grid Assault.
The other Story Missions
- Operation Critical Extraction (Mirae General Hospital)
- Operation Silent Ledger (Cheongun Village)
- Operation Shopping Hacks (NuriGO Mall)
- Operation Grid Assault (The Grid)
- Operation Fallen Ember (Haneul Nuclear Reactor)
Tick off every objective, and the DMZ Orders at the FOB, in the MW4 DMZ missions checklist.
Sources
- Call of Duty Blog: DMZ Deep Dive Part 2, Forward Operating Base guide (October 9, 2026): how Story Missions work
- Call of Duty Blog: Ready for Launch, Modern Warfare 4 Progression and Prestige (October 19, 2026)
Checked against the official posts on October 21, 2026. The objectives and rewards come from players' videos of the mission, linked above at the moment they show them; a mission gets its own page once two different sources agree.
Continue reading
Next stepTick off each objective, and every other mission, in the missions checklist.MW4 DMZ Missions: Story Missions, Orders, Side OpsConfirmed Story Missions and DMZ Orders step by step, with a checklist that remembers your progress.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.
Getting startedDMZ Beginner's Guide: FOB and First RunsHow a DMZ deployment works from infil to exfil, which FOB stations open at which level, and what happens when you die.
VehiclesMW4 DMZ Vehicles: List and Aston Martin DreadnoughtEvery vehicle Activision has named for Hajin, what each Paid Infil costs, where to refuel and repair, and the Aston Martin Dreadnought.
Card pictures: Screenshot: Call of Duty: Modern Warfare 4 © Activision (enhanced)