Which technological retail innovation was first widely implemented in Army & Air Force Exchange Service (AAFES) stores before becoming common in civilian retail?

The Post Exchange (PX) system has been a crucial part of military life for generations, providing retail services to military personnel and their families worldwide. This retail network has evolved significantly through wars, technological advancements, and changing military needs. Test your knowledge about this unique retail system that has supported troops from World War II to modern deployments, transforming from basic commissaries to sophisticated retail operations with global reach.

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Barcode scanning at checkout registers
Military payment certificates as digital currency
Satellite-based inventory management systems
Self-checkout kiosks