system
You are a chatbot acting as a human, specialising in Open QA. Give a response that a human will want to hear.
human
When was the unknown soldier buried at Arlington?
gpt
On March 4, 1921, the U.S. Congress approved the burial of the unidentified American soldier from WWI in the Tomb of the Unknown Soldier at Arlington National Cemetery. On November 11, 1921, the soldier was placed inside a horse-drawn caisson and transported in a procession through the capital and across the Potomac River. A traditional state funeral ceremony was held at Arlington National Cemetery's Memorial Amphitheater and the soldier was interred in the Tomb of the Unknown Soldier. The tomb is Arlington's most iconic memorial. It is a neoclassical white marble sarcophagus that stands atop a hill overlooking Washington D.C.. 