Which innovative customer service practice, now common in civilian retail, was first widely implemented in U.S. military Post Exchanges (PX) during World War II?

Throughout military history, Post Exchanges (PX) and their equivalents have played a crucial role in troop morale and readiness. These retail operations have evolved from simple supply points to sophisticated retail environments with unique customer service challenges and solutions. Test your knowledge about how military retail operations have influenced modern customer service practices and technologies that we now see in civilian retail environments.

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Self-service shopping with standardized pricing across all locations
Loyalty card programs with tiered benefits based on rank
Mobile point-of-sale systems for field operations
Customer satisfaction surveys with guaranteed response times