Which retail innovation was first widely implemented in military exchanges (PX/BX) during the 1970s before becoming standard in civilian retail?

Military exchanges (PX/BX) have evolved dramatically since their inception, becoming sophisticated retail operations that serve military personnel worldwide. These unique retail environments have pioneered innovations that later influenced civilian retail. This poll tests your knowledge about a groundbreaking retail innovation that originated in military exchanges during the Cold War era and later transformed civilian retail operations.

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Barcode scanning at checkout registers
Unified inventory management systems across global locations
Self-service checkout kiosks
Customer loyalty card programs