Which retail technology was first widely implemented by the U.S. Military in the 1970s, allowing deployed personnel to purchase items without physically visiting a store?

The military has pioneered many retail innovations over the decades to serve personnel efficiently. From commissaries to PXs (Post Exchanges), the armed forces have developed unique retail systems. One particular retail technology advancement revolutionized how military personnel shopped while deployed. Test your knowledge about this significant military retail development that later influenced civilian shopping methods worldwide.

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Catalog Shopping via Military Postal System
AAFES Mobile Exchange Vehicles (MEVs)
Military Exchange Credit Card System
Automated Vending Systems with ID Card Readers