George Washington's Birthday became a Federal holiday in 1880. In 1888 and 1894, respectively, Decoration Day (now Memorial Day) and Labor Day were created. In 1938, Armistice Day (now Veterans Day) was created to mark the end of World War I.
On June 30, 1973, Archie Turner was the last known person drafted into the US Army. Though he did not choose to join the Army, he chose to stay.
While no one has been drafted in 46 years or so, there is still a potential for a draft, and you are required to register for the draft at age 18 at the post office. The actual draft age would be adjusted according to the manpower needs of the military.