"The United States Flag Code outlines certain guidelines for the use, display, and disposal of the flag. For example, the flag should never be dipped to any person or thing, unless it is the ensign responding to a salute from a ship of a foreign nation. This tradition may come from the 1908 Summer Olympics in London, where countries were asked to dip their flag to King Edward VII: the American flag bearer did not.
Team captain Martin Sheridan is famously quoted as saying "this flag dips to no earthly king", though the true provenance of this quotation is unclear."source: Wikipedia
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