In 1913, Josephus Daniels was appointed Secretary of the Navy by President Woodrow Wilson.  As the story goes, on June 1, 1914, Secretary Joe issued General Order 99.   Order 99 prohibited alcohol aboard naval vessels.  From then on, the strongest drink of any kind allowed on naval ships has been coffee.   The presumably disgruntled and sober sailors weren't happy with the changes, so they started to call coffee a "Cup of Joe" out of spite.   So, come by the National Museum of the U.S. Navy for your FREE Cup-O-Joe.