Which retail innovation was first widely implemented in military PX stores during the Vietnam War that revolutionized how troops accessed consumer goods?

Military retail systems have evolved significantly over the decades, with Post Exchanges (PX) and Navy Exchanges becoming vital morale boosters for troops worldwide. These retail operations represent unique consumer ecosystems with fascinating innovation stories that changed how military personnel access consumer goods. Test your knowledge about a breakthrough retail innovation that transformed military shopping during a critical period in military history.

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Credit card acceptance systems
Self-service department store model
Mail-order catalog fulfillment centers
Automated inventory management systems