Which military retail innovation from WWII is widely considered the precursor to modern self-service supermarkets and influenced post-war retail customer journey design?

Throughout history, military conflicts have driven significant innovations in retail and commerce. From wartime rationing systems to military PX (Post Exchange) operations, the armed forces have pioneered retail concepts that later transformed civilian shopping. This poll tests your knowledge about how military retail operations influenced modern commercial practices and technological advancements that we now take for granted in everyday shopping experiences.

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The Army PX (Post Exchange) system with its standardized layout and inventory management
Navy ship canteens with their space-efficient shelving and queueing systems
Air Force commissaries with their punch-card inventory tracking
The Marine Corps' mobile field stores with rotating product displays