"... he found that there was no need to sneak it, it was perfectly OK even by regulations. I may be mixing up my books, and it wasn't Barb, but US boats weren't exactly dry during WW2."
General Order 99, effective 1 July 1914
"The use or introduction for drinking purposes of alcoholic liquors on board any naval vessel, or within any navy yard or station, is strictly prohibited, and commanding officers will be held directly responsible for the enforcement of this order."
JOSEPHUS DANIELS
Secretary of the Navy
But, boys will be boys. A skipper was always placing a lot of trust in his crew when he chose to violate a standing order. To share a beer or a glass of wine halfway through a patrol was a big deal.