Which innovative retail practice was first widely implemented in U.S. military exchanges before becoming common in civilian retail?

Post Exchanges (PX) and Base Exchanges (BX) have been a crucial part of military life for generations, providing essential retail services to service members and their families worldwide. These unique retail operations have evolved significantly over time, adapting to changing military needs while creating their own distinct retail culture. Test your knowledge about this special sector of military retail that has influenced both military life and civilian retail practices.

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Self-checkout technology
Tax-free shopping
Universal product code (barcode) scanning
Online ordering with in-store pickup