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Ukratko odgovor na tvoje pitanje:
There are two main reasons why retraining an old crew is preferred over recruiting a fresh one:
Retention of Secondary Specializations
Fresh crews, regardless of what primary specialization that they started with, will not have any Secondary Specializations. Since secondary specializations are not lost, it is better to retrain the old crew so that the bonuses that they provide are kept, even if it means the tankers in the crew will have a drop in primary specialization.
Continuation of the Crew Member's Career
Crew member will keep their statistics and awards regardless of what vehicle they are put in. Even though a retrained veteran might preform as well as a fresh tanker, the veteran's personal records are kept, including medals.