Which military retail innovation was first widely adopted during World War II and later influenced civilian retail operations worldwide?

The Post Exchange (PX) and Base Exchange (BX) systems represent one of the most unique retail operations in history, serving military personnel and their families worldwide. These tax-free department stores have evolved from simple sutler wagons following Civil War troops to modern retail complexes that boost morale and provide essential services. This poll tests your knowledge of how military retail operations have shaped both military life and civilian retail innovations.

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Self-service shopping model (allowing customers to select their own merchandise without clerk assistance)
Military payment certificates (scrip currency) as an alternative to credit cards
Commissary benefit program (subsidized grocery pricing for service members)
AAFES mobile retail trucks (bringing products to forward operating bases)