Which innovative retail system, first widely implemented during World War II, revolutionized how military personnel purchased goods and later influenced civilian point-of-sale technology?

Throughout military history, retail systems for troops have evolved dramatically. From the sutlers of the American Civil War to today's high-tech exchanges, how soldiers shop has reflected both military necessity and retail innovation. This poll tests your knowledge of a pivotal development in military retail history that transformed how armed forces personnel accessed goods during deployment and influenced civilian retail practices.

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The Military Exchange Card System, which introduced the first magnetic-stripe payment cards for troops overseas
The Army Post Exchange (PX) punch card inventory system, which pioneered automated inventory tracking for deployed units
The Naval Commissary Token Program, which eliminated currency needs through a proprietary token-based payment network
The Air Force Mobile Canteen Network, which created the first mobile point-of-sale terminals for remote airfields