Which revolutionary retail innovation was first widely implemented in U.S. military Post Exchanges (PX) during the 1950s, years before civilian retailers adopted it?

The military Post Exchange (PX) system represents one of history's most enduring retail innovations, serving military personnel and their families for generations. These stores have evolved from simple trading posts to sophisticated retail operations that have pioneered technologies later adopted by civilian retailers. Test your knowledge about how military retail operations have transformed over time and influenced modern retail concepts!

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Self-service shopping with shopping carts
Universal Product Code (UPC) barcode scanning
Electronic point-of-sale systems with inventory tracking
Credit card payment processing