In 1907, the Grand Lodge of the Benevolent and Protective Order of Elks designated, by resolution, June 14 as Flag Day. The Grand Lodge of the Order adopted mandatory observance of the occasion by every Lodge in 1911, and that requirement continues. The Elks prompted President Woodrow Wilson to recognize the Order’s observance of Flag Day for its patriotic expression. But it was not until 1949 when President Harry Truman, himself a member of the Elks, made the proclamation that thereafter June 14 would be a day of national observance for the symbol of our country. It was through his Elks Lodge in Independence, Missouri, that President Truman got the idea for a national observance of Flag Day.
National Flag Day Foundation