Which retail innovation was first widely deployed in military PX (Post Exchange) systems during the Vietnam War before becoming standard in civilian retail?

Throughout military history, post exchanges (PX) and base retail operations have played a crucial role in troop morale and readiness. These military retail systems evolved from simple sutler wagons following armies in the field to sophisticated global retail networks. Today's military retail operations incorporate advanced point-of-sale systems that track purchasing patterns across continents, helping military planners understand deployment needs and supply chain requirements. Test your knowledge about this unique intersection of military logistics and retail operations!

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Magnetic stripe card readers for ID verification at checkout
Barcode scanners for inventory tracking
Electronic cash registers with digital displays
Computerized inventory management systems