Each side's Secretary of the Navy, President, and Vice-President are authorized to transfer men between that side's ships. The CO or XO of the ship that is giving up the crew may also submit a transfer order for his ship.
(What follows will be updated:) Ironclads may not be raised above 800 crew and 200 Marines, nor below 70 men. River ironclads may not be raised above 600 crew and 150 Marines, nor below 70 crew. Sloops may not be raised above 250 crew and 25 Marines, nor below 25 crew. TR groups may not be raised below 1 crew per 10 capacity; there is no upper limit on crew on a TR group. If a transfer order would violate these limits, the order is not carried out.