Which retail innovation was first widely implemented in military Post Exchanges (PX) during World War II before becoming standard in civilian retail?

The Post Exchange (PX) system has been a cornerstone of military retail for over a century, providing essential goods and services to troops worldwide. This retail innovation has evolved from simple sutler wagons following armies to sophisticated retail operations with global supply chains. Test your knowledge about how military retail operations transformed during wartime, creating innovations that later influenced civilian retail practices.

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Self-service shopping model (customers selecting their own merchandise without clerk assistance)
Point-of-sale (POS) electronic cash registers
Barcode scanning technology
Buy-now-pay-later credit systems