On Friday, the president took part in a memorial at the Pentagon on the eighth anniversary of the September 11th attacks. It was just one of many ceremonies marking this event. Memorials at the former site of the World Trade Center in New York included a moment of silence. The city's mayor also praised the newly established "National Day of Service and Remembrance." Half a world away, U.S. troops in Afghanistan held ceremonies as well, honoring the lives of those people killed on 9/11 and service members who have died in battle since then.
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