Which groundbreaking retail innovation did the U.S. military introduce in 1895 that later influenced civilian retail strategies?

The Army & Air Force Exchange Service (AAFES) and Navy Exchange (NEX) represent a unique retail innovation in military history - providing tax-free shopping and essential services to military personnel worldwide. These stores evolved from simple sutler wagons following troops in the 1800s to modern retail complexes. Test your knowledge on how these military retail innovations have shaped both military life and retail strategies through history!

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The first standardized mail-order catalog system allowing soldiers to order goods from anywhere in the world
The Post Exchange (PX) system, creating fixed retail locations with regulated prices and quality standards
The first retail credit card system, allowing soldiers to make purchases and pay later from their military wages
The military commissary self-service grocery store model, predating civilian supermarkets by nearly 30 years