"Here rests in honoroed glory, A Comrade in Arms, known but to God". At the Omaha Beach memorial, there is a room which contains a monument to the "battlefield grave": a soldier's rifle planted bayonet-down in the dirt, with his helmet and dog tag atop it.
In this room, one name of an American soldier, sailor, or airman who died in Operation Overlord is played every 30 seconds. It would take you nine days to hear all of the names.