M850 Grizzly

The M850 Grizzly, formally the M850 Main Battle Tank, is an armored mobile weapons platform in service with the United Nations Space Command. It was developed by Chalybs Defense Solutions, the manufacturer of the older and more common M808 Scorpion.

Overview
The M850 Grizzly shares a similar design to the M808 Scorpion. For ease of mobility across varied terrain, the Grizzly is fitted with a four-bogey tread configuration, similar to the Scorpion's. Compared to the M808, the M850 MBT is more heavily armored due to its large profile. As with the Scorpion, the driver's access hatch is located in the center of the chassis in front of the turret.

The turret is larger than that of the Scorpion and features a separate access hatch, as it is designed to support two M310 "120mm" smooth-bore high-velocity cannons, as opposed to the M808's single M512 "90mm" cannon. The cannons can be outfitted with S1 canister shells, which produce a high explosive blast radius, increasing the weapons' lethality against all targets. Like the Scorpion, the M850 Grizzly features a single coaxial M247T Medium Machine Gun mounted on the turret to the right of the cannons; post-war models also include a pintle-mounted M247T near the turret access hatch. Smoke grenade launchers are affixed to the forward edges of the turret.

Operational history
The M850 Grizzly, being manufacturated in 2509, is not as old as Chalybs Defense Solutions' better-known, more widely deployed M808 Scorpion, which has been in service since the Insurrection. The origins of the Grizzly are shrouded due to maneuverings by many competing bureaucratic and corporate interests within the UNSC at the time of its development. The Grizzly quickly found a niche with Army and Marine units despite initial skepticism and the logistical challenges of transporting it. The Grizzly proved invaluable both as an anti-armor vehicle and a mobile fortress that could drive straight into the heart of insurrection positions and outgun any rebel armored vehicles. The beginning of the Human-Covenant War cemented the Grizzly’s reputation as the bane of enemy armored vehicles. On the open field the Grizzly was practically unstoppable, and often forced the Covenant to deploy naval assets in order to decisively end the threat that even one or two tanks could cause to their staging areas and supply columns.

Its first known deployments occurred during the Harvest campaign, during which it performed exceptionally. While investigating a Forerunner structure on Harvest in early February 2531, a platoon of Marines assigned to the, as well as Professor Ellen Anders, were attacked by Covenant forces. Two Grizzlies, which had been personally upgraded by Sergeant John Forge, were sent to the structure to rescue the survivors. They made their way through several Covenant blockades, killing dozens of infantry and destroying large amounts of matériel while sustaining very little structural damage. As Anders and Forge were airlifted from the site, the Grizzlies remained behind to cover their escape.

On February 23, 2531, Spirit of Fire was suddenly drawn toward the interior of Shield World 0459; three platoons remained groundside, prompting the crew to attempt a hasty retrieval operation. Alpha Platoon was escorted by a Grizzly, which was used to provide cover fire for the Marine infantry as they fought numerous Flood forms. Though the Marines were highly susceptible to infection while on foot, those inside the sealed cockpit of the tank were immune; this allowed the MBT's crew to clear a path for the infantry and other vehicles, who eventually arrived at a hastily established firebase. When the survivors reached the evacuation zone, the tank was presumably left behind.

The M850 saw limited use later in the war. This was not due to poor performance, as the Grizzly was considered to be very powerful and reliable. Rather, it was due to the tank's exorbitant cost, stringent maintenance requirements, relative difficulty of transportation, and the remaining heavy-lift spacecrafts were tasked for high-priority reconstruction. After the Human-Covenant War, several Army units maintained Grizzly units for planetary defense. Several Grizzlies were used in the Battle of Draetheus V against Merg Vol's Covenant faction.

Halo Wars
In-game, the Grizzly is an extremely capable vehicle, suitable for defeating large numbers of enemy troops and vehicles. Since it possesses a secondary canister shell attack, it can kill infantry with ease due to the shell's large blast radius. The armor plating is superior to that of most vehicles, able to survive multiple shots from a Hunter's assault cannon, and can survive a sustained hit from a Scarab's main gun twice as long as a Scorpion. The coaxial machine gun has a faster firing rate and inflicts more damage per hit than the Scorpion's, at the cost of a longer reload time. Its main disadvantages are the cost it requires to be researched, its reduced effectiveness against other vehicles and its minor ineffectiveness against airborne units. Like the Scorpion, it is "hard countered" by Cobras, especially while they are in lockdown mode. Though the in-game model features smoke grenade launchers they are not usable.

In Halo Wars 's skirmish and multiplayer modes, the Grizzly serves as one of Sergeant John Forge's unique units. It is accessed as an upgrade to the Scorpion.


 * Resources: 1800 (upgrade for Scorpion); 500 (for individual unit)
 * Minimum Tech Level: 4 (upgrade for Scorpion); 2 (for individual unit)
 * Population Count: 3

Halo: Spartan Assault
The player can operate the M850 Grizzly in the campaign levels Assault on the Covenant Landing Zones and Breach of the Bulwark. The coaxial M247T machine gun is present but cannot be used by the player. Instead, as with the game's version of the Scorpion, the player may utilize an M247T mounted on top of the main turret; this machine gun may be rotated 360 degrees. The Grizzly is the most powerful vehicle in the game, far outclassing the firepower and armor of the Scorpion and Wraith. Its main cannons have a high rate of fire and produce a heavy degree of splash damage, allowing the player to keep targets under near-constant fire.

Trivia

 * The Grizzly is uncannily similar in appearance and role to the iconic Mammoth tanks of the Command & Conquer franchise. Both the Grizzly and the Mammoth rest on four independently suspended tracks, possess dual cannons and secondary weapons, and are the heaviest tank available to their respective factions.
 * Like most UNSC vehicles, the Grizzly vaguely resembles its animal namesake. Both the tank and the grizzly bear are extremely large and resistant to harm, and both possess powerful attacks; the bear is capable of decapitating a human with a single swipe of its paw, while the M850 MBT can destroy all but the most powerful ground targets with relative impunity.
 * The Grizzly was said to be equipped with a flamethrower early in the development of Halo Wars. However, as the same interview sensationally described the Cyclops as a "colossal bipedal mech", the claim may have been erroneous.

List of appearances

 * Halo Wars
 * Halo: Spartan Assault
 * Halo: Spartan Strike