Which revolutionary retail inventory management system was first developed for military PX stores during the Vietnam War and later widely adopted by civilian retailers?

The Post Exchange (PX) system has been a cornerstone of military retail for generations, providing essential goods and boosting morale for service members worldwide. These specialized retail operations have evolved from simple sutler wagons following troops to sophisticated global networks with billions in annual revenue. Test your knowledge about how military retail strategies have shaped both military life and civilian retail practices throughout history.

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Just-In-Time (JIT) inventory management
Universal Product Code (UPC) barcode system
Radio-frequency identification (RFID) tracking
Electronic Data Interchange (EDI) networks