Which retail technology innovation was first widely implemented in military exchanges (PX/BX) before becoming standard in civilian retail stores?

Military exchanges (PX for Army/Air Force, BX for Air Force, NEX for Navy) have been retail pioneers for service members since the 1800s. These stores evolved from simple sutlers' wagons to sophisticated retail operations with significant technological innovations. Test your knowledge about how military retail operations have influenced modern consumer shopping experiences and created unique marketing strategies for military personnel and their families.

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Universal Product Code (UPC) barcode scanning systems
Tax-free shopping with ID verification systems
Self-checkout kiosks
Loyalty card programs with tiered rewards