Which retail innovation did the Army & Air Force Exchange Service (AAFES) introduce during Operation Desert Storm that transformed military retail operations in combat zones?

Military exchanges (PX/BX stores) have been a crucial part of military life for generations, providing goods and services to service members and their families worldwide. These retail operations have evolved significantly since their inception, adapting to changing demographics, technologies, and military needs. This trivia question explores an important innovation in military retail that revolutionized how service members shop while deployed.

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Tactical Field Exchanges (TFEs) - mobile retail units that could follow troops into forward areas
Satellite-based inventory system allowing real-time stock monitoring
Military credit card program eliminating the need for cash in combat zones
Automated vending machines with biometric authentication