Which WWII military vehicle's design was so successful that its manufacturer trademarked its distinctive front grille pattern after the war for civilian vehicles?

During World War II, product design and branding played a crucial but often overlooked role in military equipment. Manufacturers had to quickly adapt civilian production lines to create war materiel that was both functional and identifiable. Some of these designs became so iconic that they transcended their military origins to become cultural touchstones. Test your knowledge about one of the most famous examples of wartime product design that later influenced civilian markets.

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Willys-Overland Jeep
GMC DUKW (Duck)
Dodge WC Series Truck
Ford GPW