Which retail innovation was first introduced to American military post exchanges (PX) during World War II that revolutionized how soldiers shopped and later influenced civilian retail?

The Post Exchange (PX) and Base Exchange (BX) systems have been crucial retail innovations in military history, providing essential goods and services to service members and their families worldwide. These unique retail operations have evolved from simple trading posts to sophisticated retail networks that significantly impact military life and morale. Test your knowledge about this distinctive retail system that has served millions of military personnel throughout history.

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Self-service shopping format (allowing customers to select their own merchandise without clerk assistance)
Mail-order catalogs for deployed troops
Military-exclusive branded merchandise
Credit card payment systems