Which wartime product innovation was initially rejected by the US military during WWII, but later revolutionized retail logistics and inventory management worldwide?

Throughout history, military product innovations have transformed warfare and often crossed over into civilian applications. These technological breakthroughs have not only changed battlefield tactics but also revolutionized supply chain management, logistics, and product development processes. Test your knowledge about significant military innovations that transformed both warfare and civilian product development!

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Barcodes (developed from radar-based identification systems)
RFID technology (Radio-Frequency Identification)
Duct tape (developed as waterproof sealing tape for ammunition cases)
GPS (Global Positioning System)