A major concert in Washington, D.C. is among the many events planned across the United States Tuesday during the annual Veterans Day holiday.
As many as 800,000 people are expected to gather on the National Mall in front of the U.S. Capitol for the "Concert for Valor" event, featuring such acts as rock-and-roll legend Bruce Springsteen, rhythm-and-blues singer Rihanna, country star Carrie Underwood and heavy metal band Metallica.
Organizers are hoping to use the concert to raise awareness for organizations aimed at helping military veterans once they leave active service.
The Veterans Day holiday was first observed in the United States in 1919 as Armistice Day, celebrating the formal agreement signed in Versailles, France on November 11, 1918 that ended World War I -- "the war to end all wars" -- between Germany and the allied nations of Britain, France and the United States.
Armistice Day became an official U.S. holiday in 1938, and remained so until 1954, when it was renamed Veterans Day in the aftermath of both World War II and the Korean War.
The U.S. Veterans Day holiday also coincides with other World War I-era holidays around the world, including Remembrance Day in Britain and the Commonwealth nations of Australia and Canada.