Which retail innovation was first widely implemented in U.S. military exchanges (PX/BX) during WWII before becoming standard in civilian stores?

Military exchanges (PX/BX) have a fascinating retail history that has evolved significantly over the centuries. These unique retail environments serve military personnel worldwide and have pioneered innovations that later spread to civilian retail. Test your knowledge about how military retail operations have transformed battlefield logistics and morale throughout history!

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Self-service shopping format
Electronic barcode scanning
Store credit cards
Automated inventory management