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

Military exchanges (PX/BX) represent one of the oldest retail systems in American history, evolving from frontier sutlers to today's modern shopping facilities. These tax-free department stores serve military personnel worldwide and have pioneered many retail innovations. This poll tests your knowledge about how military retail operations have shaped modern point-of-sale systems and inventory management techniques that later influenced civilian retail.

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Barcode scanning technology for inventory tracking
Credit card magnetic stripe readers
Self-checkout kiosks
Digital receipt technology