It's been happening since the 1930s, when the Salvation Army started serving doughnuts to soldiers during World War I.
Going on 100 years later, you and I can get a free doughnut (or 'donut') today, in almost any town in Northern Colorado...
National Doughnut Day is on Friday, and two local doughnut businesses are taking advantage of the day and giving back to their customers with free product throughout the day.