Flag Day (United States) holiday. William T. Kerr, a native of Pittsburgh and later a resident of Yeadon, Pennsylvania, founded the American Flag Day Association of Western Pennsylvania in 1888, and became the national chairman of the American Flag Day Association one year later, serving as such for fifty years. He attended President Harry S. Truman's 1949 signing of the Act of Congress that formally established the observance. In 1889, the principal of a free kindergarten, George Bolch, celebrated the Revolution and celebrated Flag Day, as well. In 1893, Elizabeth Duane Gillespie, a descendant of Benjamin Franklin and the president of the Colonial Dames
Flag day (computing) by "en masse" upgrades. This systems terminology originates from a major change in the Multics operating system's definition of ASCII, which was scheduled for the United States holiday, Flag Day, on June 14, 1966. Another historical flag day was January 1, 1983, when the ARPANET changed from NCP to the TCP/IP protocol suite. This major change required all ARPANET nodes and interfaces to be shut down and restarted across the entire network. Flag day (computing) A flag day, as used in system administration, is a change which requires a complete restart or conversion of a sizable body of software or