Which retail innovation was first widely implemented in U.S. military Post Exchanges (PX) during the Vietnam War era that revolutionized how soldiers shopped?

The Post Exchange (PX) system has been a cornerstone of military life for generations, providing troops with essential goods and a taste of home while deployed. Over the decades, these military retail operations have evolved dramatically in their approach to merchandising, layout, and customer experience. Test your knowledge about how military retail operations have innovated to serve personnel across different eras and conflicts.

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Self-service shopping model replacing counter service
Introduction of military-specific credit cards
Standardized store layouts across all global bases
Computerized inventory tracking systems