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The Union is the fifth boss from Metal Slug 7 and Metal Slug XX.

Details

The battle starts as the three units follow you from behind and immediately separate to attack you. They first come combined, then separates to attack, hence the name. To destroy it, the player must first destroy its cores, namely a large, red 'button'. Each unit has its own ways of attacking.

The Head Tank (with the number 01 on the front) has four main attacks. The core located behind it fires energy projectiles. The head will open up to fire a guided missile, but this missile can be shot down or dodged. The launcher on its sides launches ballistic missiles that will fall to the ground and explode. There is also an energy mortar on the back platform. A way to destroy this unit is to go to the core and destroy it with Machine Guns, or use a Shotgun or a Powered-Up Shotgun from the front, the latter being riskier but faster.

The V.T.O.L. Gunship (number 02) above both units has four main attacks. The core is located on the belly of the gunship. It also fires energy projectiles, so take caution when destroying the core. The door on the front will either launch Element Pods or fire a minigun closely similar to the Dragon Nosuke, just more rapidly and moves up and down quickly. When all segments join together, the laser gun on the tail of the gunship will fire. Use a long-ranged weapon for this fight, or go under it and shoot it. It is more accurate but riskier as the VTOL may crush the player.

The SLAVE Tank (with a number 03) has only two main attacks. The core located in front also fires energy projectiles and multi-cannons will open up on its sides firing bombs in the air similar to the bombs the Hi-Do uses. It is easy to destroy this unit as firing on it will just require the player to stand on the Head Tank's platform. Just be careful when the units join up.

When a unit is destroyed, it will explode and become invulnerable (its color drastically changes). Keep your guard up however, as while it's "destroyed", it can still attack and unite with active units. When all units are "destroyed", the Union accelerates forward and explodes, with the player(s) jumping off before it does so.

Variants

Ptolemaic Army
Union 03 Ver. PM: Code name "Deneb", the SLAVE Tank. Like the original SLAVE Tank, "Deneb" shoots parachute bombs from a side launcher, though it's core has been modified to shoot a powerful laser beam at its opponents. It is manned by Dragunov.
Union 01 Ver. PM: Code name "Vega", the Head Tank. It fires both ballistic and guided missiles. It is piloted by Sisilia.
Union 02 Ver. PM: Code name "Altair", the V.T.O.L Gunship. It can strafe enemies with its vulcan cannon and also shoots energy projectiles. It is piloted by Veronica.
Rebel Army
Union 02 Ver. Rebel: Code name "Naglfar", it is a customized variant of the V.T.O.L Gunship built by the Rebel Army. Like the original V.T.O.L. Gunship, "Naglfar" fires bullets from a vulcan cannon. It can also shoot bombs and has a turret that shoots out a powerful laser beam at its opponents. It is piloted by Chloe.
Union 03 Ver. Rebel: Code name "Naglfar", it is a customized variant of the SLAVE tank, though it still retains its signature laser beam. Chloe still pilots the Naglfar, though she sports a different uniform.

Trivia

  • This boss resembles the fifth boss from the game R-Type. Possibly an influence as certain members from Metal Slug once worked for Irem.
  • This is the only boss in the series to be able to split into different parts during a fight.
  • It seems to resemble the chopper boss from Gunforce 2, albeit, being land based and it being a tank than a chopper.
Bosses
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) | Allen O'Neil | Dai-Manji

Metal Slug 3 Huge Hermit | The Ten Commandments of Moses | Jupiter King | Sol Dae Rokker | Rootmars

Twin Ohumein-Conga | Monoeyes | Hairbuster Riberts | Hi-Do | Rugname

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 | Wall Crawler | Sand Marine | Evil Spirit Incarnate

Black Hound | Stone Turtle (unused) | Mammoth Tower | Ptolemaios (unused)

Metal Slug 6 Bull Drill | Iron Sentinel | Brain Robot | Sea Worm | Invader Queen

Invader Controller

Metal Slug 7/XX Worm Mecha | Crablops | Destroyed Crablops | Fall Mecha | The Union | Rebel Gigant | Kraken
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 | Gunslinger | Rebel Submarine | Rebel Airplane | Hilde Garn's Slug | Rocket UFO

Rebel Rocket | Hyakutaro

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

Allen Jr.

Metal Slug 3D M-3 Rocket Launch Support Van | Mosque Artillery | Spider-Bot | Underground Cruise Missile | Morden's Battleship | Morden's Castle | Allen O'Neil | Lugus | Lieu
Metal Slug Attack Pharaoh's Arc | Ball Slug | Great Mother | K-O3 Coupled Armored Vehicle | Land Blowfish | Cyclobster | Slug Square | Zoni Doloma
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