Which famous product was first widely distributed to American soldiers through military PX stores during WWII, becoming a retail phenomenon that later transformed civilian markets?

Post Exchanges (PX) and their Naval counterparts (NEX) have been vital retail institutions serving military personnel for generations. These stores have evolved from simple trading posts to modern retail operations with billions in annual sales, offering tax-free goods to service members worldwide. Test your knowledge about these unique military retail operations that have influenced both military life and retail innovation throughout history.

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Coca-Cola in specially designed bottles
Ray-Ban Aviator sunglasses
Zippo lighters with military engravings
Gillette safety razors in field kits