Which technological retail innovation was first widely implemented by the US military in Post Exchanges (PX stores) during the Vietnam War era, revolutionizing supply chain management for deployed troops?

The Post Exchange (PX) system has been a vital part of military life for generations, providing essential retail services to service members and their families worldwide. But the PX system has also been at the forefront of retail innovation throughout military history. This trivia question explores a pivotal moment in military retail history that transformed how service members accessed goods and services during deployment.

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Barcode scanning systems for inventory tracking
Telephone catalog ordering services
Punch card inventory management
Microfilm catalog kiosks