Which innovative retail practice did the U.S. military exchanges (PX/BX) pioneer decades before mainstream civilian retailers widely adopted it?

Military exchanges (Post Exchange/Base Exchange) represent a unique retail ecosystem that has served military personnel and their families for generations. These tax-free department stores have evolved from simple trading posts to sophisticated retail operations with billions in annual revenue. Beyond convenience, they provide vital funding for morale, welfare, and recreation programs that enhance quality of life for service members worldwide. Test your knowledge about this distinctive retail operation that bridges military history and retail innovation!

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Self-service shopping (allowing customers to select items without clerk assistance)
Credit card acceptance for all purchases regardless of transaction size
Online ordering with delivery to remote locations
Computerized inventory management systems