After having to be a gunner in tanks to complete some assignments (mainly the last one), I now find, having never really played tanks (too focused on infantry), that I'm now rank 4 on the Tiger, and rank 2 (nearly 3) on the Churchill.
So, I thought, why don't I upgrade and use them, I've got the CC. But, the question is, how? What are people's suggestions when upgrading the heavy tanks? Becuase I don't really have a clue, so please, help.