Which retail technology advancement was first widely implemented in military exchanges (PX/BX) during the 1990s, significantly improving inventory management during overseas deployments?

Military post exchanges (PX) and base exchanges (BX) have been crucial to soldier morale and welfare for over a century. These retail establishments provide goods to military personnel at discounted prices and generate revenue that supports morale, welfare, and recreation programs. This trivia question explores a significant retail technology advancement that revolutionized military retail operations worldwide.

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RFID tagging systems
Barcode scanning and UPC implementation
Self-checkout kiosks
Digital payment processing