It is called the Sherman Vc and is a Rank IV, Battle Rating 5.0 medium tank. The Vc is similar to the Firefly, with the same chassis, turret, and cannon. However, it sits at BR 5.0 because ...

The tech tree features some of the most recognizable tanks, from the Cromwell and the Sherman ... What makes the Firefly stand out is its long barreled 76 mm QF 17-pounder cannon.