Metal Slug Wiki
Metal Slug Wiki

The Iron Sentinel, also known as Armored Missile Tank[1], is the second boss from Metal Slug 6.


The Iron Sentinel is a giant mobile rocket launcher/tank operated by General Morden. It is heavily armored, meaning the weak spot is the giant cannon on top. It is also armed with various missile launchers and energy cannons.

According to Metal Slug Attack, this huge tank was made in cooperation with the Mars People, which explains why the tank has energy cannons and requires Mars Energy in order to upgrade its skills.

Boss Synopsis

The Iron Sentinel's weak spot is the large cannon. Its first attack is to shoot three rockets from its giant cannon at the top. The rockets will then crash onto the ground. The second attack is to fire arching projectiles from the turrets at the side. Another attack is to launch small missiles from the side of the tank, and the missiles will fly in multiple directions which are relatively easy to avoid or destroy.

Once the cannon is destroyed, it will reveal a huge rocket launcher. When launching the rocket, sparks fly out, but they can be dispatched with gunfire. The giant rocket flies off-screen and then crash to the ground, causing a massive explosion. The explosion sometimes give out items like an HMG crate. When the Iron Sentinel is aflame, the process of launching the giant rocket speeds up, but the rocket is still easy to avoid. Once it suffers enough damage, the tank will crash into a hill.

On Easy mode, the Iron Sentinel does not shoot rockets from its cannon.


Slider.gif Iron Sentinel: This is the original version.
Iron Vermilion MSA idle.png Iron Vermilion: A "cheaper", mass-produced variant of the Iron Sentinel, the Iron Vermilion launches more missiles but lacks the extremely large missiles that the original has. Found in Metal Slug Attack.

In Other Games

Metal Slug Attack

The Armored Missile Tank appears in the 1.8.0 update where it was renamed to the Iron Sentinel. Its unit parts can be purchased via Mars Shop at a cost of 1000 Mars Coins per part. Skill items are also bought with Mars Coins. The player can earn Mars Coins by trading excessive parts of Units that have reached the Platinum frame. The Iron Sentinel is one of the few units that gets buffed over time to justify the long-term commitment necessary to unlock all four skills.

As the Iron Sentinel's sprites are at an angle, this game rotates it in real time.


  • The Iron Sentinel, its cannon, and main cannon ammunition is based on the German WWII Super Heavy SPG Landkreuzer P1500 Monster, the Germans siege cannon Karl-Gerat, and the German Fieseler Fi-103 (aka V1 Rocket), respectively.
  • The Iron Sentinel was used to be known by fans as the Iron Slider before its official English name reveal in Metal Slug Attack.


Metal Slug 6
Heroes Marco Rossi | Tarma Roving | Eri Kasamoto | Fio Germi | Ralf Jones | Clark Still
NPCs Riviera von Wittenberg | Maryell von Wittenberg | POW | Rumi Aikawa | Madoka Aikawa | Hyakutaro Ichimonji | Donald Morden | Rebel Army | Chinese Soldier | Martians | Rootmars | Invaders | Announcer | Duke Koudou | Pupipi
Enemies Fanatics | Grenade Soldier | Bazooka Soldier | Shielded Soldier | Rebel Rifleman | Mortar | Gatling Soldier | Hunters | Mars People | Mini-UFO | Invader Squad | Winged Invader | Flying Parasite | Hunter Walker | Giant Hunter Walker | Space Mole Cricket | Crab-Tank | Vanguard | Smasher | Invader UFO | Flying Shelt | Flying Core | Flying Killer | Maggot
Enemy Vehicles Di-Cokka | T-2B Melty Honey | MV-280C | Nop-03 Sarubia | Girida-O | M-15A Bradley | 3-ton Utility Truck | Walking Locomotive | R-Shobu | MH-6S Masknell
Bosses Bull Drill | Iron Sentinel | Brain Robot | Elder Centipede | Invader King


Weapons Heavy Machine Gun | Rocket Launcher | Shotgun | Flame Shot | Enemy Chaser | Iron Lizard | Super Grenade | Drop Shot | Two Machine Guns | Zantetsu Sword | Grenade | Fire Bomb
Slugs SV-001 (Type-R) | Slug Flyer | Donkey Slug | Protogunner | Rootmars Slug | Slug Digger
Missions "African Winds" | "The Illusion of El Dorado" | "Asian Impact" | "Golden Bridge is Falling Down" | "Ancient Law"
Other Combat School | Weapon Stock | Rush Blaster System
Metal Slug Tetsuyuki | Hairbuster Riberts | Tani Oh | Shoe & Karn | Iron Nokana | Hi-Do

Mini-Bata | Allen O'Neil

Metal Slug 2/X The Keesi II / Iron Nokana MK II (X) | Aeshi Nero | Dragon Nosuke | Big Shiee | Hozmi | Rugname

Mosque Artillery | The Keesi II (X) | Karn (X) | Allen O'Neil | Dai-Manji

Metal Slug 3 Huge Hermit | Monoeye UFO | Jupiter King | Sol Dae Rokker | Rootmars

Twin Ohumein-Conga | Monoeyes | Hairbuster Riberts | Hi-Do | Rugname | Fake Rootmars | Clone Incubator

Metal Slug 4 Brave Guerrier | Toschka Dalanue | The Iron | Big John | Sea Satan | Amadeus Mother Computer

Mecha Allen O'Neil

Metal Slug 5 Metal Rear | Shooting Ray | Screamer | Sand Marine | Avatar of Evil

Black Hound | Stone Turtle (unused) | Gaia Elephant | Ptolemaios (unused)

Metal Slug 6 Bull Drill | Iron Sentinel | Brain Robot | Elder Centipede | Invader King

Invader Controller

Metal Slug 7/XX Worm Mecha | Crablops | Destroyed Crablops | Fall Mecha | The Union | Rebel Gigant | Kraken

Scrap Tower | Big Gate

Metal Slug: 1st Mission Rebel VTOL | Rebel Train | Macba | Rebel Zeppelin | Electromagnetic Crane | Weapons Port Boss | Hilde Garn

Facility Elevator | Macba | Rebel Truck

Metal Slug: 2nd Mission Big Bertha | Terrain Carrier | Rebel Reactor | Macba | Rebel Submarine | Tani Oh | Wired | Rebel Airplane | Hilde Garn's Slug | Rocket UFO

Power Generators | Rebel Rocket | Hyakutaro

Metal Slug Advance Formor | Emain Macha | Kaladgolg | The Keesi III | Cabracan

Allen Jr.

Metal Slug 3D Parachuetruck | Mosque Artillery | Spider-Bot | Underground Cruise Missile | Morden's Battleship | Morden's Castle | Allen O'Neil | Lugus | Lieu
Metal Slug Attack Pharaoh's Arc | Ptolemaios | Ball Slug | Great Mother | Mars Gigantalos | K-O3 Coupled Armored Vehicle | Land Blowfish | Cyclobster | Slug Square | Zoni Doloma | Quadro Jumper | Denturion | D-Gu | Fortmeranian | Rock Mole | Giant Copter | Et A Omnis | Vortex | Digger Base | Crusty Legs | Armored Crawler | Queen Big Snail | 7000 Class Locomotive | Riviere Hyll | Metal Fusioner No.223
Mobile games Rocket Control Room | Unknown Alien | Hellfire | Spiderbot | Cyclops | Mega Laser Turret | Mars Battle UFO | M-32 Water Carrier Plane | Kourai | Alien Floating Structure