Which retail innovation, first widely implemented for American troops during World War II, revolutionized military supply chains and later influenced civilian retail systems?

Throughout military history, retail and supply innovations have significantly impacted warfare outcomes. From ancient logistics to modern military PX systems, the evolution of how military supplies reach soldiers has shaped strategic capabilities. This poll tests your knowledge of a groundbreaking retail innovation that transformed military supply chains during a critical period in history.

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The PX (Post Exchange) self-service store model
Military catalog ordering system with air-dropped deliveries
Standardized military currency for international purchasing
Automated inventory tracking via punch card systems