Which innovative retail store layout concept was first widely implemented in U.S. military exchanges (PX/BX) during the 1960s that later influenced civilian retail?

Post-WWII military exchanges (PX/BX) represented a unique retail innovation that boosted morale and provided affordable goods to service members worldwide. These tax-free retail establishments evolved from simple commissaries to sophisticated retail operations with distinct store layouts and product selections tailored to military consumers. Test your knowledge about how these specialized retail environments shaped military consumer culture and product design throughout the Cold War era.

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Self-service department store format with specialized product zones
Automated vending machine complexes for 24-hour shopping
Circular "hub and spoke" layout with central checkout stations
Catalog showroom with warehouse-style bulk purchasing