In world of warships I have so far only found where you can train the commander when he is assigned to the ship, not after the fact. Correct? And did I see correctly that training a new commander costs 10,000 credit, but training an existing commander from reserve costs 200,000 credits?
In world of tanks you can increase the training level of a crew after they have been assigned to a tank. So for example if they were first trained for free, you can later train them to 75% or 100% if they haven't reached that level yet. Regards, C.