Which retail-transforming product innovation was developed during WWII specifically for military logistics, but revolutionized civilian shopping habits in the 1950s?

During wartime, product innovation often accelerates dramatically. The military-industrial complex has been responsible for countless inventions that later transformed civilian markets. This trivia question focuses on one of the most significant product innovations developed specifically for military use during World War II that later revolutionized retail and consumer markets worldwide. Test your knowledge about how military necessity drove a product innovation that changed shopping habits forever!

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Barcodes (originally used to track military equipment)
RFID tags (initially developed for aircraft identification)
Self-service shopping carts (designed for efficient military commissaries)
Standardized shipping containers (created for rapid military transport)