M850 Main Battle Tank

"The heavily armored Scorpion tank inflicts massive damage with its primary cannon, but struggles to track fast-moving targets. One of the special Corps upgrades, the Grizzly, adds a double-barreled cannon and a flamethrower that can roast surrounding troops."

- GamePro, July Edition

Grizzly

The Grizzly is a variant of the M808B Main Battle Tank. It is set to appear in Halo Wars, accessed by upgrading the Scorpion, and usable only by the UNSC "Corps" Faction.

Overview
The Grizzly is a variant of the Scorpion, fielded exclusively by the UNSC Marine Corps. Instead of the standard Scorpion armament (a one-barreled cannon), it is armed with a double-barrelled cannon and a flamethrower.

Triva
It is unknown why it is not heard or even mentioned in the years of 2552 and 2553. possibly that it was too expensive to be further produced, the schematics for it lost, or removed in favor of the normal scorpion.