During WW2, ice cream became an important morale booster. The Navy had the ability to make ice cream but the air force in remote locations did not.
A fighter squadron mechanic came up with a way to make an ice cream maker driven by a small wind driven mounted to a wing. It was make from 50 cal cartridge boxes. They filled the box with ice cream mix then flew the fighter high enough to freeze it I saw on you tube. The rear gun on B17s were also used for make shift ice cream churns.
