Observed on the first Friday of June annually, National Donut Day (or National Doughnut Day) is celebrated not only in the United States but also in several other countries. This day traces its roots back to a doughnut-centric event initiated by The Salvation Army in Chicago in 1938. Originally, it was established to pay tribute to their members who provided doughnuts to soldiers during World War I. National Donut Day is a festive occasion dedicated to celebrating the beloved doughnut, and many doughnut shops across America mark the day by offering complimentary doughnuts to patrons.