Which military innovation led to the development of the microwave oven, revolutionizing kitchen appliance retail and food preparation worldwide?

The military has pioneered many technologies and strategies that later revolutionized retail operations. From logistics and supply chain management to digital innovation and consumer products, warfare has inadvertently shaped how we shop. This trivia question focuses on a specific military technology that transformed product design and retail strategy across multiple industries.

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Radar technology during World War II (Raytheon engineer Percy Spencer discovered food could be heated by radar waves)
Vietnam War-era satellite communications (developed by General Electric for field kitchens)
Cold War nuclear submarine power systems (adapted by Westinghouse for civilian use)
Desert Storm tactical field equipment (miniaturized by Amana for home applications)