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In page Hamilton Fish III:

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Upon entering the House, the young Fish was the only veteran of World War I in Congress.[1] On December 21, 1920, he introduced a resolution instituting Veterans Day as a national holiday. Fish also introduced House Resolution 67 of the 66th Congress, which provided for the interment of the remains of an unknown American soldier in a hallowed tomb to be constructed outside the Memorial Amphitheater in Arlington National Cemetery. Congress approved the resolution unanimously on March 4, 1921.[1] The tomb, completed in 1937 with Fish's input,[1] came to be known as the Tomb of the Unknown Soldier.[citation needed]