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The yellow ribbon has long been a symbol of support for absent or missing loved ones. There are some who believe that the tradition of the yellow ribbon dates back as far as the Civil War era, when a yellow ribbon in a woman’s hair indicated that she was “taken” by a man who was absent due to service in the United States Army Cavalry. But research by professional folklorists has found no evidence to support that story. The Library of Congress itself traces the cultural ubiquity of this powerful symbol to the well-known song by Tony Orlando and Dawn: “Tie a Yellow Ribbon Round the Ole Oak Tree,” which topped the U.S. pop charts on April 21, 1973.