Which wartime innovation first led to the widespread establishment of permanent PX (Post Exchange) stores that revolutionized military retail?

The Post Exchange (PX) system has been a crucial element of military retail for over a century, providing soldiers with essential items and a taste of home while deployed. This retail innovation has evolved dramatically through major conflicts, becoming a sophisticated global retail operation that influences civilian retail practices. Test your knowledge about this unique military retail experience that bridges battlefield necessities with home comforts.

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World War I created the need for standardized supply chains and permanent retail facilities near training camps
The Civil War's sutler system was formalized into government-run stores to eliminate price gouging
Vietnam War's remote bases required the development of the modern PX system with comprehensive inventory
The Spanish-American War prompted the first overseas military retail operations