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

The Post Exchange (PX) and Navy Exchange (NEX) systems represent one of the oldest and most unique retail operations in American history. These military retail establishments have served troops since the 19th century, providing essential goods and a touch of home to service members worldwide. This poll tests your knowledge about a significant innovation in military retail that changed how soldiers shopped during deployment.

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Mobile PX trucks that followed front-line units
K-rations with branded consumer products
The Ship's Service portable department store
The 'Imprest Fund' system allowing units to purchase local goods