Up until this year I was in the dark about Veterans Day. So I did a little research on the subject.
Veterans Day is celebrated on November 11 because it is the anniversary of the signing of the Armistice that ended World War I in 1918. An interesting bit of trivia is that the Germans signed the Armistice on the eleventh hour of the eleventh day of the eleventh month of that year.
November 11 is remembered in the United Kingdom as "Remembrance Day" and as "Armistice Day" in France. In some locales a moment of silence is kept at the eleventh hour.
In 1968, the United States moved Veterans Day to the nearest Monday (to ensure a three-day weekend), but this decision was met with protests so that it was officially moved back to November 11th proper in 1978.
Happy Veterans Day!