In the United States, the Navy League of the United States organized the first Navy Day in 1922, holding it on October 27 because it was the birthday of 26th President Theodore Roosevelt (1858–1919, served 1901–1909), who was a naval enthusiast/promoter of sea power and former assistant Secretary of the Navy just before the Spanish–American War of 1898.
In the 1970s, historical research found that the "birthday" of the earlier Continental Navy during the American Revolutionary War (1775–1783), was determined to be October 13, 1775, and so Chief of Naval Operations Admiral Elmo R. Zumwalt worked with the Navy League to define October 13 as the new date of Navy Day. However, Navy Day in the United States is still largely recognized as October 27.
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