The Rebel Army saw that they needed to improve upon the LV Armor, and so their engineers prepared a new version with better armor capable of resisting heavier weapon fire. It now carries a Vulcan, as well as a 100mm cannon on the back. However, it cannot swap weapons like the older LV Armor could, and due its upgrades, the heavier Slug Armor cannot double-jump. The Rebels could only make one unit due to a shortage of resources, and ironically, it was stolen by the Regular Army before its creators could deploy it.
In gameplay, the Slug Armor can take an extra hit than its predecessor, and boasts infinite Vulcan ammo. It is able to fire diagonally in a similar manner as the Slug Gunner and Heavy Machine Gun, improving its line of fire immensely, although it still cannot turn its body around (except off-screen) and can only shoot enemies in front of it. The Slug Armor moves much faster on foot, and while crouching can additionally use its hover pack to charge, potentially running over enemies. Although it can still move freely move on the ground and fire its weapons while crouched, it cannot jump nor attack upwards until it stands upright again.
However, in Metal Slug XX, the Slug Armor swaps places with the Slugnoid, found on a moving platform near the start of the mission (and ditched at the end of the elevator ride if it survives that long), while the Slugnoid is instead found in the vehicle crate prior to facing the boss.
|Slug Armor: The original design, built by the Rebel Army and then promptly stolen by the Regular Army.|
|ver.Kusanagi / ver.Yagami: Variants in Metal Slug Attack seen in the The King of Weapons event, based upon the King of Fighters characters Kyo Kusanagi and Iori Yagami.|
|Tetsujin Kun 01 / 02: Variants in Metal Slug Attack designed by Midori.|
|Golden Slug Armor A golden-colored variant in Metal Slug Attack which possess more health and firepower.|
- It also appears in Metal Slug Defense in version 1.24.0, using Stampede via its hover engine as a standard attack, and its Vulcan and cannon as special attacks. Despite retaining the logo of the Rebel Army, it is treated as a Regular Army unit.
|Mechanized||SV-001 (Metal Slug) | Slug Copter | Slug Flyer | Slug Sub | Astro Slug | Slug Gunner | Slugnoid | LV Armor | Walking Machine | Slug Mariner | Drill Slug | M-15A Bradley | Metal Claw | Forklift | Slug Mobile | Augensterm | Protogunner | Slug Digger | Slug Trolley | Slug Armor | Slug Gigant|
|Animal||SV-Camel | Elephant Slug | Ostrich Slug | Donkey Slug|
|Other||Middle-Son 1986 | Middle-Son 1999 | Motorcycle | Regular Army Helicopter | Landseek | PA33-21 Boat | RA-TTT | Rootmars|