Which wartime innovation permanently transformed military retail history by establishing the modern Post Exchange (PX) system we recognize today?

The Post Exchange (PX) system has been a crucial aspect of military retail history, providing essential goods and services to service members and their families worldwide. These stores have evolved dramatically over time, from simple sutler wagons following troops in the field to modern department store-like facilities. This poll tests your knowledge about this unique retail system that has significantly impacted military morale and welfare throughout history.

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The Civil War's sutler system that followed Union Army regiments
World War II's Ship's Service stores aboard naval vessels
The Spanish-American War exchanges that formalized the Army & Air Force Exchange Service
Vietnam War's combat PXs that first introduced name-brand civilian goods