Which famous consumer product was originally developed for military use in WWII, then successfully marketed to civilians with the slogan "You can be SURE if it's Westinghouse"?

Throughout military history, product marketing has played a surprising role in warfare. From battlefield equipment that gained commercial fame to military innovations that transformed into everyday products, the connection between war and commerce runs deep. This trivia question explores one of the most famous cases of military product marketing that changed both warfare and civilian consumption patterns. Test your knowledge about how military necessity became marketing opportunity!

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Duct tape (developed for waterproofing ammunition cases)
Ray-Ban aviator sunglasses (designed for Air Force pilots)
Radar technology (repurposed as microwave ovens)
Jeep vehicles (marketed as reliable family transportation)