National Donut Day goes beyond just celebrating with a tasty treat. It's not really a Hallmark holiday, but it's a celebration day honoring history.
National Donut Day began in 1938. It honors the Salvation Army "Donut Girls" who served soldiers coffee and donuts during both world wars.
It started when two volunteers got crafty and fried donuts in soldiers helmets. The treats were given to boost morale on the front lines.
The unofficial holiday is celebrated every year on the first Friday in June.