Which retail technology innovation was first introduced in military exchanges (PX/BX) during the 1990s, revolutionizing how service members shopped while deployed?

The military retail system has a fascinating history that many civilians don't know about. Post Exchanges (PX) and Base Exchanges (BX) have been serving military personnel for over a century, providing everything from basic necessities to luxury goods at tax-free prices. These retail innovations have evolved significantly over time, becoming an important part of military life and morale. Test your knowledge about one of the most significant retail technology innovations that changed military shopping forever.

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Mobile PX trucks with satellite communication systems
AAFES Online Shopping (the precursor to today's military e-commerce)
Biometric payment systems linked to military ID
Automated PX kiosks with barcode scanning technology