Salvation Army volunteers traveled overseas to set up
service “huts” located in abandoned buildings near the
front lines where they could serve baked goods
It's a holiday that was started to honor the people of the Salvation Army who gave out donuts to the troops during WWI to lift their spirits in wartime.
"National Doughnut Day started on June 7, 1938 when a young military doctor by the name of Morgan Pett was sent to a military base. On his way there he stopped at a bakery and picked up 8 dozen doughnuts. When he arrived at the base he started helping many wounded soldiers, and would give them a free doughnut. One man he helped was a Lieutenant General by the name of Samuel Geary. Samuel Geary greatly appreciated the help on his leg, and the doughnut (as he was a very comical man) so he decided to make a fund raiser with Morgan Pett to give every wounded soldier, and the needy a doughnut. This fund raiser was later joined with the Salvation Army."