Which innovative retail strategy did the U.S. Army Post Exchange (PX) system pioneer in the 1940s-50s that later influenced civilian retail?

The Post Exchange (PX) system has been a crucial part of military life and morale for generations. These retail establishments serve military personnel and their families on bases worldwide, offering everything from everyday necessities to luxury items at tax-free prices. This poll tests your knowledge about this unique retail operation that has shaped military commerce and culture for over a century.

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Self-service department store model with multiple product categories under one roof
Mail-order catalog system with military-specific product codes
Membership-based pricing tiers based on military rank
Rotating seasonal inventory based on deployment locations