By the way, did you know that dog tags were provided to Chinese soldiers way back in the mid-19th century?
OK, back to the "unknown soldier" and how he was picked out of the many. The first step was that four bodies were collected from cemeteries at great battlegrounds of WWI. The bodies were shipped to a hotel in Chalons-sur-Marne (in eastern France) on October 23, 1921. The next morning, Sergeant Edward Younger, carrying a spray of white roses, entered the room that contained the caskets. He circled the caskets three times and placed the flowers on the third casket from the left. The casket was inscribed with "An Unknown American who gave his life in the World War".
Here is a picture of the Tomb of the Unknown Soldier:
So now you know the story behind the "Unknown Soldier. Now, I hope you all have a great day, you hear?