Which retail innovation was first widely implemented by the U.S. military in their Post Exchange (PX) stores during WWII, years before becoming standard in civilian retail?

Throughout military history, retail systems have played a crucial role in troop morale and readiness. From the sutlers of the Civil War to modern military exchanges, retail operations have evolved alongside warfare tactics. Post Exchanges (PX) and Base Exchanges (BX) represent one of the most significant retail partnerships in military history, providing essential goods to service members worldwide. Test your knowledge about this unique intersection of military logistics and retail history!

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Self-service shopping (customers selecting their own merchandise without clerk assistance)
Credit card payment systems
Barcode scanning technology
Membership discount programs