Which innovative retail customer engagement strategy was FIRST implemented by the Army & Air Force Exchange Service (AAFES) during the Vietnam War?

The Post Exchange (PX) system represents one of the most unique retail customer journeys in history. Established to serve military personnel and their families worldwide, these retail operations have evolved from simple sutler wagons following troops in the 1800s to sophisticated retail networks. They've faced unique challenges in inventory management, customer engagement, and brand positioning while operating in combat zones, remote bases, and peacetime installations. How well do you know this distinctive military retail institution?

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Mobile PX trucks that brought retail products directly to forward combat bases
Military-branded credit cards allowing soldiers to purchase items with deferred payment
Deployment of interactive digital kiosks for remote ordering from frontline positions
Implementation of RFID tracking for personalized inventory management