Buckles, 106, is one of only three surviving American World War I veterans and the youngest.
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Besides Buckles, the VA has identified the only other living World War I veterans as Harry Landis, a 107-year-old living in Sun City Center, Fla., and Russell Coffey, a 108-year-old in North Baltimore, Ohio.
After the last Navy veteran and the last American woman to serve in World War I died days apart in March, the VA made a public appeal to identify any other veterans of the war, but found no others, said VA spokesman Matt Burns.
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Canada and Britain will mark the end of a generation with a tribute after the last World War I veteran dies. There are four or five living veterans in Britain and at least one in Canada, according to historians. In the U.S., the VA and historians have only begun talking about how to commemorate World War I veterans. Paul said the story of "the war to end all wars" has been eclipsed by the "Greatest Generation" of Americans who fought in World War II.