Which wartime retail innovation first introduced the modern concept of Post Exchange (PX) stores, revolutionizing how military personnel accessed consumer goods?

The military retail ecosystem has a fascinating history of innovation that directly impacts service member morale and readiness. Post Exchange (PX) stores have evolved from simple sutler wagons following troops to sophisticated retail operations generating billions in revenue annually. These retail innovations not only provide everyday necessities to military personnel worldwide but also fund important Morale, Welfare and Recreation (MWR) programs. Test your knowledge about this unique military retail innovation!

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Civil War 'Sutler Stores' that followed Union Army camps
World War I 'Canteens' established by the American Expeditionary Forces
Revolutionary War 'Commissary Wagons' authorized by George Washington
Vietnam War 'R&R Centers' with expanded retail offerings