Buckles, who served as a U.S. Army ambulance driver in Europe during what became known as the "Great War," rose to the rank of corporal before the war ended. He came to prominence in recent years, in part because of the work of DeJonge, a Michigan portrait photographer who had undertaken a project to document the last surviving veterans of that war.
As the years continued, all but Buckles had passed away, leaving him the "last man standing" among U.S. troops who were called "The Doughboys."
In recent years, Buckles became an advocate for a memorial in Washington to honor those who served in the "Great War". Link -via Fark