Which innovation did the Army & Air Force Exchange Service (AAFES) pioneer in 1979 that revolutionized military retail operations and was adopted by civilian retailers years later?

The Post Exchange (PX) system represents one of the world's largest retail operations that most civilians rarely encounter. These military department stores have evolved from frontier trading posts to sophisticated retail networks that serve millions of military personnel and their families worldwide. This poll tests your knowledge about this unique retail operation that has significantly impacted military life and morale throughout history.

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Barcode scanning technology at all PX registers
The Military Star credit card system
Self-checkout kiosks in base exchanges
Computerized inventory management across all locations