The Comet I "Iron Duke IV" is a premium gift British medium tank. It was introduced during Update 1.57 "Battle March" as a reward for the 2016 WW2 Chronicles event. Armed with a 77 mm HV gun, essentially a 17-pounder with a lower muzzle velocity, it has one of the more powerful guns available for a medium tank at the rating.

The Comet is an excellent medium tank. It has great mobility and acceleration, able to reach 38 km/h very quickly and stay there in full throttle, but its reverse speed is pitiful like the Cromwell's. Firepower is also a benefit of the vehicle, especially after the unlocking of the APDS shot, giving it the penetration needed to deal with any threat you might encounter. The drawback of the design is the sub-par armour that can be pretty easily penetrated at BR 5.3. One should take advantage of the Comet's low profile and mobility to hide and manoeuvre from the enemy to catch them at an advantageous angle. The Comet also has a benefit the previous tanks in its branch, the Sherman Firefly, didn't have in the great gun depression. This allows the Comet to more easily fire over hills in an hull-down position to destroy the enemy with the most the best terrain benefit for protection.

Iron Duke IV was the tank of Lieutenant-Colonel Pat Hobart, commander of the 1st RTR, 7th Armoured Division.