World War I

Vietnam veterans place mementos on the Vietnam Women's Memorial during the dedication ceremony of the bronze sculpture depicting three nurses and a wounded soldier, by Glenna Goodacre, in Washington, D.C., Thursday, Nov. 11, 1993. Thousands of veterans attended the dedication of the memorial, which honors more than 11,000 women who served in the Vietnam War. (AP Photo/Marcy Nighswander)

Photos: Observing Veteran's Day from WWI to the Vietnam Memorial

Cara Kuhlman

Originally commemorated as Armistice Day, November 11 became "Veteran's Day" in 1954 when the federal holiday was expanded to celebrate all American veterans. Archival images show Americans commemorating veterans from the end of fighting in World War I to dedicating a memorial for the women who served in the Vietnam War.

Gen. John "Black Jack" Pershing visits Arlington National Cemetery in 1925. Pershing led the U.S. forces in World War I, the moment when the American military first displayed its might in a major foreign war. The U.S. military suffered heavy losses, but it also expanded dramatically, modernized and became more professional under Pershing's command.

At A Hefty Cost, World War I Made The U.S. A Major Military Power

Greg Myre

The U.S. was a reluctant entrant into World War I. But when America joined the battle 100 years ago, on April 6, 1917, it transformed a small military in a major international force almost overnight.

U.S. horses were loaded onto transport ships that went from the U.S. to European ports and later to the war front.

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The Unsung Equestrian Heroes Of World War I And The Plot To Poison Them

Sarah McCammon

April 6 marks 100 years since the U.S. entered World War I. Years before, the U.S. supported the effort by sending over thousands of horses, which were so important that Germans plotted to kill them.