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Beer Day is a tradition in the United States Navy. After 45 consecutive days out to sea the Commanding Officer can authorize two beers for each crew member over the age of 21 (18 in some commands). This is generally the only exception to the US Navy's prohibition of alcohol aboard ship.
At other events such as Steel Beach Picnics non-alcoholic brew such as O'Douls may be served, however this does not constitute a Beer Day.
Starting September 21st, 2001, ten days after 9/11, the USS Dubuque (LPD-8) spent nearly 90 days at sea before receiving authorization to hold Beer Day.
Sometimes, Beer Days are unregulated, causing sailors to become legimately inebriated. Some sailors will give their beers (or beer tickets in some commands) to other sailors who wish to consume more alcohol at sea. This has been a problem in some commands, and since 2001, commands have taken measures to regulate beer days by having sailors sign for their beer tickets, ensuring that they won't be given away.
source Wikipedia