Which wartime innovation transformed the US military's PX (Post Exchange) retail system into the modern global network we recognize today?

The Post Exchange (PX) system represents one of the most successful retail innovations in military history. Developed to serve military personnel and their families worldwide, it has evolved from simple trading posts to sophisticated retail operations. This poll explores how this unique military retail system changed during a pivotal moment in American military history, combining brand storytelling with retail innovation in a way that transformed military life.

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World War II's Ship's Service stores that expanded to overseas bases and standardized pricing
Vietnam War's introduction of digital inventory management and overseas franchising
Korean War's development of mobile PX units with rotating product catalogs
Gulf War's implementation of cross-service retail integration and shared logistics