Which retail innovation did the U.S. military introduce during World War II that revolutionized how soldiers accessed consumer products in combat zones?

Post Exchange (PX) and Base Exchange (BX) stores have been crucial morale boosters for military personnel throughout history. These retail innovations have evolved dramatically from simple sutler wagons following Civil War troops to modern military shopping complexes. This poll tests your knowledge about a significant retail innovation that transformed how military members accessed consumer goods during a critical period in military history.

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Ship's Service stores on aircraft carriers
Mobile PX trucks with standardized pricing
Catalog ordering system with battlefield delivery
Token-based exchange system for local market goods