Which famous product was originally developed for military use in WWII but later became a household staple with over 2 billion civilian units sold worldwide?

Throughout history, certain military products have revolutionized warfare and became iconic symbols of their era. These innovations often represented technological breakthroughs, changed tactical doctrines, and sometimes even altered the course of major conflicts. This trivia question challenges your knowledge about a famous product that had significant historical impact in military operations. Test your understanding of how commercial manufacturing and military needs intersected to create legendary equipment!

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Jeep (Willys MB)
Ray-Ban Aviator sunglasses
Silly Putty
Coleman portable stove