National Donut Day was established over 80 years ago by the Chicago Salvation Army to honor women who served donuts to soldiers during World War I. For nearly 70 of the years since then, Dunkin’ has been serving customers donuts.

That tradition continues on Friday, June 7 with the return of National Donut Day. The chain that sells more than 3.1 billion donuts and donut hole treats annually worldwide will offer a free classic donut of customers’ choice with the purchase of any beverage at participating locations.

Guests can enjoy classic donut favorites including glazed, chocolate glazed, strawberry frosted with sprinkles, cinnamon, and many more. Through the brand’s social channels, Dunkin’ will encourage fans to enjoy some down time and ‘Dunk Out’ on National Donut Day.

“Donuts are part of the American story and hold a special place in our popular culture, so we believe a day for donuts is a day for America. This National Donut Day, we encourage Americans to take a moment to ‘Dunk Out,’ recharge, and enjoy their favorite donut variety at Dunkin’,” says Dunkin’ U.S. Chief Marketing Officer Tony Weisman.