This image was acquired from
flickr. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
monuments washington dc washingtondc military history militaryhistory people smithsonian probably public domain probablypublicdomain SI Neg. . Date ...The changing of the guards during sunrise ceremony at the Tomb of the Unknown in Arlington National Cemetery Arlington Virginia. ..Credit Lindsay Downs Smithsonian Institution SI