This is how the Tomb of the Unknown Soldier came to be

At the heart of Arlington National Cemetery lies one of our nation's most magnificent displays of honor and respect to our fallen troops. Three unnamed graves are tended to by some of the most disciplined soldiers the military has to offer. The soldiers tirelessly guard the monument. Every hour (or half hour, during the spring and summer months), the guard is changed with an impressive, precise ceremony.

Each year, these three fallen soldiers receive up to four million visitors — but it's not about honoring the specific individuals contained within the tomb. In death, these three fallen soldiers have became a symbol, representing each and every troop who gave their last breath in service of this great nation. Every step taken by the sentinels, every bouquet of flowers offered, every wreath laid, and every flag placed is for every American troop who has fallen.

This is exactly what was intended when the Tomb of the Unknown Soldier was dedicated almost one hundred years ago, on November 11, 1921.

The King of England is also the head of the Church of England, so he chose to place the Tomb of the Unknown Warrior in Westminster Abbey, where all future kings and queens would be crowned, married, and buried.

(Official White House Photo by Pete Souza)

The tradition of honoring a fallen but unknown troop actually originated as a joint effort between France and the UK.

In 1916, David Railton was a chaplain in the English Army serving on the Western Front of World War I. Near Armentières, France, he discovered a rough, wooden cross planted in the middle of a battlefield. It read, simply, "an unknown British soldier, of the Black Watch."

David Railton would go on to join the clergy after the war, but the image of that cross never left his mind. It took years, but after many attempts, he finally got the ear of Bishop Herbert Ryle, the Dean of Westminster. Railton wanted to repatriate the remains of this fallen soldier and give him proper honors, despite not knowing his identity. Bishop Ryle was moved by Rev. Railton's passionate words and went directly to King George V with his proposal.

Reverend Railton would later say,

"How that grave caused me to think!... But, who was he, and who were they [his folk]?... Was he just a laddie... . There was no answer to those questions, nor has there ever been yet. So I thought and thought and wrestled in thought. What can I do to ease the pain of father, mother, brother, sister, sweetheart, wife and friend? Quietly and gradually there came out of the mist of thought this answer clear and strong, "Let this body – this symbol of him – be carried reverently over the sea to his native land." And I was happy for about five or ten minutes."

The soldier was buried at Westminster Abbey, London on November 11, 1920, thus creating what's now known as The Tomb of The Unknown Warrior.

It's fitting that the Arch built in honor of the French victory in WWI would also be the final resting site for her unknown soldier.

(Photo by Jorge Lascar)

Meanwhile, across the English Channel, in France, a young officer in the Le Souvenir Français, an association responsible for maintaining war memorials, had better luck. He argued for bringing an unidentified fallen soldier into the Pantheon in Paris to honor of all fallen French soldiers from the Great War — and his proposal garnered support.

Both England and France decided to share the honors. They buried France's Unknown Soldier underneath the Arc de Triomphe on the same day as The Unknown Warrior was laid to rest at Westminster.

(U.S. Army photo by Spc. Cody Torkelson)

The next year, as the United States began the process of repatriating remains from the European battlefield, plans for an American Tomb of the Unknown Soldier began to take shape. The originator of the idea remains unknown to history, but the selection process was public. On October 24, 1921, six American soldiers were asked to come to Châlons-sur-Marne, France. Each soldier was a highly decorated and highly respected member of their respective units. They were selected to be pallbearers for the remains as they made their way back to the States.

While there, the officer in charge of grave registrations, Major Harbold, randomly selected one of the men. He gave Sgt. Edward F. Younger a bouquet of pink and white roses and asked him to step inside the chapel alone. There, four identical, unmarked coffins awaited him. He was told that whichever coffin he laid the roses on would be laid to rest in the National Shrine.

Younger said of the event,

"I walked around the coffins three times, then suddenly I stopped. What caused me to stop, I don't know, it was as though something had pulled me. I placed the roses on the coffin in front of me. I can still remember the awed feeling that I had, standing there alone."

The remains were brought to the Capital Rotunda and remained there until November 11th, 1921. President Warren G. Harding officiated a ceremony in which he bestowed upon the Unknown Soldier the Medal of Honor and a Victoria Cross, given on behalf of King George V.

Since that day, the entombed soldier has been guarded every moment of every day, rain, shine, hurricane, or blizzard.