Which famous military retail innovation from World War II later revolutionized civilian marketing and is still used in retail strategy today?

Throughout history, military equipment sales have evolved dramatically, from simple sword shops to massive defense contractors. This poll tests your knowledge about how military retail and marketing has shaped the course of history. Military equipment has often been at the forefront of retail innovation, with specialized marketing techniques and customer experiences that would later influence civilian commerce. How much do you know about the business side of military history?

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The PX (Post Exchange) system, which created the modern concept of convenience stores and influenced shopping mall development
Military surplus sales, which pioneered the concept of outlet stores and discount retail chains
War bonds promotional campaigns, which created the modern concept of loyalty programs and rewards-based marketing
Rationing cards, which developed into the early concept of membership-based shopping clubs like Costco and Sam's Club