Which wartime innovation in military retail supply chain management during WWII dramatically changed how PX systems operated and later influenced civilian retail logistics?

The Post Exchange (PX) system has been a crucial element of military life for generations, providing essential goods and services to service members worldwide. This unique retail ecosystem has evolved significantly throughout military history, adapting to wartime conditions, technological changes, and shifting consumer demands. Test your knowledge about this distinctive military retail institution that has supported troops from World War I to modern conflicts.

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The development of the 'fast-moving consumer goods' (FMCG) categorization system
The introduction of containerized shipping for standardized transport of PX goods
The implementation of the 'Red Ball Express' emergency logistics system
The creation of centralized procurement through the Defense General Supply Center