Which retail innovation was first introduced by the U.S. Army Exchange Service in 1949, revolutionizing how military personnel shopped on bases?

The Post Exchange (PX) system is a cornerstone of military retail history, providing essential goods and services to service members worldwide for generations. These distinctive retail environments have evolved dramatically from their humble beginnings as sutlers' wagons to becoming sophisticated retail operations. This trivia question explores a pivotal moment in the corporate history of military retail that shaped how armed forces personnel access consumer goods on bases around the world.

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Self-service shopping format (first military supermarket)
Credit card payment system for military personnel
Mail-order catalog exclusively for overseas troops
Commissary price-matching with civilian retailers