Which famous military product branding strategy was created during WWII and later became a billion-dollar civilian retail phenomenon?

Throughout military history, product marketing and merchandising have played surprising roles in supporting war efforts, boosting morale, and creating lasting brand legacies. From specially designed ration packaging to officially licensed memorabilia, military organizations have engaged in sophisticated product marketing strategies. This poll tests your knowledge of how military institutions have leveraged product design and marketing throughout history.

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Jeep vehicles, originally designed as 'General Purpose' (GP) vehicles for the military before becoming a popular civilian brand
Ray-Ban aviator sunglasses, designed for Air Force pilots before being marketed to civilians
Swiss Army knives, initially standard-issue equipment before becoming retail products
Timex watches, which gained fame through military durability tests before civilian marketing campaigns