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Black pennant meaning ...

Oldgateboatdriver

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The "pirate" flag is not, repeat, not an attack flag for submarines (how would you fly them underwater?). It is flown upon return home to indicate a succesful mission, not merely return from patrol. Success may be having sunk ennemy vessels (war time) or fulfilling a specific tasked mission (such as carrying out a surveillance mission on a new potential ennemy warship in peace time).
 
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