Which retail innovation was first widely implemented in military Post Exchanges (PX) during World War II before becoming standard in civilian retail?

Post Exchanges (PX) and Base Exchanges (BX) have been crucial retail operations supporting military personnel and their families for generations. These military retail systems have evolved dramatically over time, pioneering retail innovations that later became common in civilian markets. Test your knowledge about how military retail operations have transformed through history and their impact on modern retail practices.

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Self-service shopping format
Barcode scanning technology
Loyalty card programs
Online ordering systems