As we honor Veterans Day, we examine the population of those who served. There are an estimated 18 million veterans in the United States. The first anniversary of the end of World War I, Nov. 11, 1919, was the first "Armistice Day," which is when Veterans Day officially began. It was declared a yearly celebration by Congress in 1926 and a national holiday in 1938. Veterans Day honors all Americans, living and dead, who have served their country. #veteransday #military