Which famous retail partnership was first established in military PX stores during World War II before becoming a civilian retail sensation?

The Post Exchange (PX) system has been a cornerstone of military retail for generations, providing essential goods and a taste of home to service members worldwide. This retail network has evolved significantly from its humble beginnings to become a sophisticated retail operation with billions in annual sales. How well do you know the history and impact of this unique military retail institution that has influenced civilian retail practices and created iconic brand partnerships?

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Ray-Ban sunglasses for U.S. Army Air Forces pilots
Hershey's D ration chocolate bars for combat rations
Zippo lighters with military division engravings
Gillette safety razors in military grooming kits