Which wartime innovation led to the formal establishment of the modern military exchange (PX/BX) system that revolutionized how military personnel shopped?

The military exchange system (PX/BX stores) represents one of the oldest retail operations in America, serving military personnel and their families worldwide. These stores have evolved from simple sutlers' wagons following troops in the field to modern retail complexes offering everything from basic necessities to luxury goods. Test your knowledge about this unique retail operation that has been an integral part of military life and history!

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World War I canteen services established by the War Department in 1917
Civil War sutlers' wagons licensed by the Union Army in 1862
Revolutionary War commissary system established by George Washington in 1775
Vietnam War mobile PX units developed for jungle operations in 1968