M808 Scorpion

"Tank beats Ghost! Tank beats Hunter! Tank beats everything! Oh, man, I could do this all day!"

- An anonymous Marine's remark of the M808 Scorpion during the Battle of Installation 00.

The M808 Main Battle Tank, commonly known as the Scorpion, is the United Nations Space Command's mainline armored mobile weapons platform. It was manufactured by Chalybs Defense Solutions then later Acheron Security.

Overview
The M808 has proven itself to be the workhorse of UNSC armored attack vehicles. Its 90mm cannon can deliver a devastating blow to anything it targets - infantry or armor. Its thick titanium-ceramic armor can withstand a direct hit from a Covenant Fuel Rod Cannon and continue on with enough armor to keep fighting. Its one man crew severely limits human casualties; along with its main offensive capabilities, four infantrymen can sit on the tread pods of the tank, providing support while using the tank as a transport until they reach their destination.

Design details
The M808 Scorpion is the UNSC's lead armoured vehicle, having served for almost thirty years. Its four-track nacelles design, with each track mounted on an independent computer-controlled suspension system, allows the M808 Scorpion to traverse, climb over, or maneuver around large debris or other battlefield obstacles, and prevents the vehicle from being easily disabled. The Scorpion is not the most powerful or quickest UNSC MBT, but it is often considered to be the best marriage between those two qualities.

The central chassis is simple in design containing the main armament at the stern of the hull, a pintle-mounted machine gun, and the crew compartment forward of it. The chassis is covered with heavy titanium-ceramic armor plating, making it incredibly resilient to small-arms fire; however, it is still possible for infantry-portable anti-armor weapons to inflict catastrophic damage. The M808 Scorpion only requires two personnels to fulfill its effective role; the driver pilots the vehicle and has complete control of the main armament while the gunner would man the machine gun. Up to four additional passengers may ride on (and fire from) the vehicle's "jumpseats", though doing so would put them at great risk of enemy counter-attack.

Along with its weapons system the Scorpion is equipped with anti-mine detecting software and electronics to help increase safety while in use.

Propulsion
The Scorpion's efficient engine allows it to travel up to 466 miles or 750km before needing to be refueled. Along with its offensive capabilities as an anti-vehicle platform, the M808 also fulfills the role of anti-infantry; its machine gun can effectively take down heavily armored and shielded targets at medium range, and the main gun is devastating to infantry targets at any range, instantly killing targets at the impact zone and severely injuring those close by.

Armament
The M808 Scorpion is equipped with a two-tier weapon system. Its primary armament is the M512 Smooth Bore High Velocity Cannon, a gun capable of firing 90mm tungsten shells and canister rounds with a three-to-four-second interval between each firing session. The primary weapon is also equipped with an autoload feed system, requiring no manual loading from the armor's personnel. The tank can also be outfitted with a 105mm gun for greater offensive power.

Its secondary armament is a pintle-mounted M247T machine gun, capable of firing 7.62mm armor-piercing rounds at a very high rate.

Operational history
"Hey, How does 90 millimeters of tungsten strike you?"

- Gunnery Sergeant Stacker's remark of the M808 Scorpion's main cannon during the Battle of Installation 00.

The M808 Scorpion was manufactured in 2218. During the Insurrection rebels would utilize stolen Scorpions against the UNSC. The M808 Scorpion was still in service with the UNSC during the events of the Human-Covenant War, serving alongside the M808B Scorpion and the M850 Grizzly.

During the Fall of Reach in 2552, Scorpions were dispatched around the continent of Eposz, battling the Covenant invaders, particularly during the Battle at Szurdok Ridge. As the invasion draws to the end, a Scorpion was abandoned near the Covenant-occupied Farragut Station, near the ONI facility Sword Base. It was recovered by SPARTAN-B312 and the ODST squad accompanying the Spartan, later causing the destruction of the nearby Covenant anti-air cannons, and paving the team's way to Sword Base's gate. More Scorpions saw action during the Battle of Aszod, but most of them were destroyed under the overwhelming Covenant forces.

Numerous Scorpions were utilized by the UNSC Marines during the Battle of Mombasa, but most of them, again, were destroyed by the Covenant, especially because the diminishing number of Marines in the city. As the battle draws to an end, three ODSTs from a surviving squad commandeered a Scorpion during their escape on the city's Waterfront Highway and escort an important asset.

During the later parts of the Battle of Earth, the military base Crow's Nest was used as a storage for UNSC vehicles, including Scorpions, some of which were destroyed when the Covenant assaulted the base.

Near the conclusion of the Human-Covenant War, particularly throughout the Battle of Installation 00, three Scorpions, one of them commandeered by John-117, were deployed from near Installation 00's Cartographer to punch through the Covenant defense to get to the Cartographer. In the ending hour of the war, a Scorpion, dropped from a D77H-TCI Pelican was utilized in the Battle of the Citadel, in which it played a vital role to eliminate the two Covenant Scarab walkers.

The carried several M808s during her operations in both Battles of Requiem, two of which were commandeered once again by John-117, the first being used to clear a path to the grounded Infinity, and the second to punch through the Covenant defenses around the gravity well generator holding the ship within Requiem.

Upon her return to the planet six months later, Infinity again deployed Scorpions to assist in ground operations, including another two that were assigned to Spartan Fireteam Crimson during their mission to the site codenamed Apex.

Variants

 * M808B Scorpion - A variant with a coaxial M247T Medium Machine Gun.
 * M808B2 Sun Devil - A variant with two twin-linked 40mm autocannons.
 * M808B3 Tarantula - A variant with its two mounted pods on either side of the turret can fire clusters of hypervelocity Scimitar rockets.

Changes from Halo 3/Halo 3: ODST to Halo: Reach

 * The tank has considerably less armor than its earlier counterparts, making it somewhat more balanced with the Wraith.
 * The tank visually recoils when firing the main gun. Shell casings are released out the back of the turret when it is fired.
 * The cockpit now has a translucent canopy, which reveals the driver.
 * The main gun is more powerful, with a larger blast radius; it has the ability to destroy a Wraith with two shots.
 * The main gun can be blasted off, rendering the tank ineffective in assaulting.
 * The velocity of the main cannon fire has been slightly decreased.
 * The reticule of the main gun now has vertical bars on its sides that fill as the the cannon is reloaded.
 * The secondary turret now overheats after continuous fire, much like the Wraith's turret.
 * The turret now slows down to a stop after rotating, it also turns slower than in Halo 3 and the Scorpion's rotating speed is also slower.
 * The tread coverings may be destroyed, which prevents the ODSTs on the level The Package from riding on them.

Changes from Halo: Reach to Halo 4

 * The velocity of the main cannon has been drastically reduced, now traveling at a fraction of the speed seen in any other game. The shot also arcs visibly at long range.
 * Along with other UNSC vehicles, a heavily damaged Scorpion will emit a siren.
 * The tank's speed has once again been decreased.
 * The pintle-mounted machine gun has been given more accuracy and now behaves more similarly to the Warthog's machine gun turret.
 * The tank's reticule has been changed to a more closed design with a circle at the centre.

General

 * A scorpion is a predatory arthropod animal, in keeping with the UNSC's tradition of naming atmospheric vehicles after real animals, with the exceptions of the Cyclops and Gremlin, which are named after mythical creatures, and the Broadsword, Longsword, Shortsword, and Sabre, which are named after bladed weapons.
 * The Scorpion tank resembles an actual scorpion with the front body being the pincers, the rear body being the legs and the cannon being the tail and its stinger.
 * The Legendary Map Pack features the map Avalanche, a remake of the classic Sidewinder. For the remake, the Scorpion tank is adorned in full snow camouflage, along with all other UNSC vehicles. Avalanche is also the first Halo 3 multiplayer map to have a Scorpion placed in it by default.
 * In Halo: Reach Multiplayer Beta, the Scorpion had the word "MARINES" marked on its armor. This is not present in the final game.
 * In Halo: Reach, the achievement "Tank Beats Everything" is earned by keeping the tank intact during the ninth mission on Legendary difficulty.
 * A Scorpion tank is on display in the Museum of Humanity. A small model of the tank is also on display in the museum.

Easter Egg

 * In Halo: Reach, the code "S-052" is painted on the side of the Scorpion. This is a reference to SPARTAN Jorge-052, as well as a reference to Bungie's obsession with the number seven (0+5+2=7).
 * In Halo 4 several different warning labels are present on the Scorpion. They read:
 * "DANGER! STRONG MAGNETIC FIELD; NO METALLIC IMPLANTS; NO NEURO STIMULATORS; SERIOUS INJURY MAY RESULT"
 * "DANGER: KEEP HANDS CLEAR OF MOVING MACHINERY"
 * "DANGER: ELECTRIC SHOCK RISK 121 GW"
 * "ELECTRICAL CONNECTION PORT; CONTAINS HIGH VOLTAGE: RISK OF ELECTRICAL SHOCK; CAN CAUSE INJURY OR DEATH; DISCONNECT ALL REMOTE ELECTRICAL POWER SUPPLIES BEFORE SERVICING"
 * "INVISIBLE LASER RADIATION: AVOID EYE OR SKIN EXPOSURE TO DIRECT OR SCATTER RADIATION LASER TYPE UNSC HIGHVOL WAVELENGTH 343NM, 1024NM; OUTPUT POWER: CLASS IV LASER".
 * One of the labels appears backwards.
 * All of the Scorpions in Halo 4 bear the number 0383, a reference to the number seven (0+3+8+3=14, 14/2=7). They also bear two skull decals; one on the left front tread and another on the left side of the main gun's barrel.

Glitches

 * It is possible to perform the Turretless Vehicle Glitch on a Scorpion. It is not possible, however, to then attach another weapon and still be able to drive; for some reason, the Scorpion automatically applies the parking brake.
 * In Halo 3, if you melee off the machine gun turret, it will still fire with the bullets appearing to be coming out of where the turret barrel would have been.

List of appearances

 * Halo 3
 * Halo 3: ODST
 * Halo: Reach
 * Halo 4
 * Spartan Ops
 * Halo: Spartan Assault
 * Halo: Spartan Strike
 * Halo 5: Guardians