According to the book "Wolfpack: The american submarine strategy that helped defeat Japan", the requirements/standards established in 44 by the US Navy for medals are:
Bronze Star: 2 ships sunk in a patrol
Silver Star: 3 ships sunk in a patrol ori a DD ori larger combatant vessel, or a special mission worthy of this award
Navy Cross: 4 ships sunk in a patrol or a BB, CV or CA or a highly dangerous mission
For all of these 2 ships damaged will be considered as one sunk.
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