Which military technology product launch in the late 1940s transformed civilian retail and created a multi-billion dollar consumer industry?

After World War II, many military technologies and innovations found their way into civilian markets, creating entirely new product categories and revolutionizing retail. One particular military-developed product launched into the consumer market became so successful it created an entirely new retail segment worth billions today. Test your knowledge of how military innovation transformed post-war retail with this challenging question!

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Microwave ovens (based on radar magnetron technology)
Aerosol spray cans (developed for military insecticide delivery)
Duct tape (originally created as waterproof sealing tape for ammunition cases)
Jeep vehicles (direct civilian conversion of military transport)