Which retail innovation was first introduced by the Army & Air Force Exchange Service (AAFES) during the Vietnam War that revolutionized shopping for deployed troops?

The Post Exchange (PX) system revolutionized retail for military personnel, providing essential goods and services worldwide. These military department stores have a fascinating history that spans centuries and have evolved significantly since their origins. Test your knowledge about this unique retail system that has served millions of service members and their families across the globe.

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Mobile PX trucks that brought retail goods directly to forward operating bases
Mail-order catalogs with free shipping to APO/FPO addresses
The Military Star credit card system
Online shopping portals accessible via military networks