Challenger 

Type: Cruiser tank

Nationality: Great Britain

Named Challenger or A-30. To increase the antitank capability of their Cruiser Tank units, the British tried to adapt the powerful 17-pounder gun on the chassis of a Centaur/Cromwell. The result was disastrous.
First, it was necessary to enlarge the hull to fit in the turret planned for a heavy tank. Since the whole was too heavy, the armor thickness had to be reduced. The amount of embarked ammunition was insufficient and the hull MG had to be sacrificed to increase internal stowage capacity.
The Sherman Firefly which appeared in the meantime, took over the mission of the Challenger during the campaign in Europe and only a limited number of Challengers saw action.
Identification: The Challenger has six road-wheels vs. five for the Cromwell/Centaur. Its turret is much higher and its gun longer.
Built by N/A
Other designation(s): A-30
Based on: Cruiser tank

British Challenger (do not mix up with today's tank of the same name). Note the high turret and the long 17-pounder gun. The excessive top weight severly impaired the performance of the vehicle, despite the enlargement of the Cromwell-like hull.