Which retail innovation was first widely implemented in U.S. military post exchanges (PX) during World War II that later became standard in civilian retail?

Military exchanges and post exchanges (PX) have a fascinating retail history that has evolved alongside military operations worldwide. These unique retail establishments have served military personnel and their families for generations, offering everything from necessities to luxury items, often in remote or challenging environments. Test your knowledge about how these specialized retail operations have innovated and adapted throughout military history.

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Self-service shopping format
Credit card payment systems
Barcode scanning technology
Membership loyalty programs