yah retraining old crew for new tank is better as u can use their skill for the next tank
i keep one crew for my TD line
and one for my medium line

when i bought a higher tier tank for one of the line i retrain the old crew to the new tank , selling the old tank if no needed

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Added on October 6, 2012, 12:53 pmfacing that T32 in 1 vs 1 when i only have little hp left , wow my hand cant stop shaking even after the match..... but still manage to win

Still not a good TD

Stuglll is much better TD

Each crew 20k at 75% for transfer crew.
But you new tank will have perks skill crew. 

Crew start at 75% max until 90% only. Unless you used gold then 100%
If dun want spent that 20k.....even in jgpanzer skill is 100% ...transfer to jgpanther only 50%

hey tiger I this is from the wiki

Tank Academy

        At the cost of 200 Gold, this option trains or retrains a crew member to 100% training level.

Regimental School

        At the cost of 20,000 credits, this option trains/retrains a crew member as follows, but never below 75% training level:

            If the crew member is retraining to a vehicle of the same class, then the final training level is 90% of the crew member's current training level.
            If the crew member is retraining to a vehicle of a different class, then the final training level is 80% of the crew member's current training level.

Rapid Courses

        This option is free, and retrains a crew member as follows, but never below 50%:

            If the crew member is retraining to a vehicle of the same class, then the final training level is 80% of the crew member's current training level.
            If the crew member is retraining to a vehicle of a different class, then the final training level is 60% of the crew member's current training level.

wat u mean collect tank in any form? o.O