The Comet Tank is unlocked via Hammer Specialization. An improvement of the Cromwell tank, the Comet has thicker armor, a much more powerful main gun, and retains all of the original vehicle's speed and agility.
The 77mm High Velocity Gun is perfect for engaging and chasing enemy targets- both tanks and infantry are prime targets, although it it still more effective verses vehicles. The cannon also enjoys a slightly superior range to some armored units, but watch out for assault guns and heavy tanks. With it's formidable armor and speed it is possible to break through the enemy lines, destroy the target and then safely retreat. It can also roll up close to toss a grenade, effective against weapon teams.
Like the Cromwell, the Comet tank can be upgraded with a tank commander to increase veterancy rate and improve sight range. Also like the Cromwell, the Comet tank can fire a smoke shell to block line of sight.
Compared to the Churchill Mk. VII Infantry Tank, the Comet is a bit more expensive and less armored, but has better firepower, reload, and speed. Of course, it is generally the most expensive non-doctrinal unit in the game to keep an eye on it and use the smoke canister if in trouble.