Which retail innovation was first widely implemented in military exchanges (PX/BX) before becoming standard in civilian retail during the 1950s?

Military exchanges (PX for Army/Air Force, BX for Air Force, NEX for Navy) have been crucial retail operations supporting troops and their families for generations. These stores evolved from simple sutlers' tents during the Civil War to modern retail powerhouses with billions in annual sales. Test your knowledge about how these military retail operations have shaped both military life and civilian retail practices through innovations in distribution, pricing strategies, and customer loyalty programs.

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Self-service shopping format with shopping carts
Price matching guarantee policy
Universal product coding system (precursor to barcodes)
Store-branded credit card for purchases