Which military product was originally designed for WWII soldiers, became an iconic troop souvenir, and later evolved into a major civilian brand still popular today?

During World War II, product design and military necessity converged in fascinating ways. One particular item became so synonymous with American GIs that it transformed from a military necessity into a cultural icon. This poll tests your knowledge of how military equipment crossed over into civilian product design and branding after wartime use, creating lasting commercial legacies from battlefield innovations.

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Zippo lighters
Ray-Ban aviator sunglasses
Swiss Army knives
Jeep vehicles