Which retail innovation was first widely implemented in US military Post Exchanges (PX) during WWII, dramatically changing how soldiers shopped and influencing civilian retail after the war?

The Post Exchange (PX) system revolutionized retail operations within military environments, particularly during major conflicts. This retail innovation transformed how soldiers accessed goods and created brand loyalties that lasted well beyond service years. Test your knowledge about this unique intersection of military history and retail innovation that shaped consumer behaviors for generations of veterans.

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Self-service store layout (allowing customers to select their own merchandise without clerk assistance)
Punch card loyalty program (tracking purchase patterns to offer personalized promotions)
Military scrip currency (specialized payment system replacing traditional cash transactions)
Mobile canteen trucks (bringing retail directly to forward operating positions)