Which wartime retail innovation first introduced by the U.S. Army Exchange Service in WWII later became standard practice in civilian retail?

Military exchanges and post exchanges (PX) have been vital retail institutions supporting armed forces for generations. These specialized retail environments have evolved from simple supply posts to comprehensive shopping destinations, influencing civilian retail practices and innovations. This trivia explores a fascinating aspect of military retail history that changed how soldiers shopped during wartime.

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Self-service shopping format
Credit card payment systems
Drive-through collection points
Computerized inventory tracking