Which of these famous military products was originally nicknamed 'The Secret Weapon' and later transformed into a well-known commercial brand after WWII?

Throughout military history, certain products and innovations have dramatically altered the course of warfare. From weapons systems to logistics solutions, these products represent turning points in how conflicts were fought. This trivia question focuses on a famous military product that had a significant impact on World War II's outcome - with surprising connections to modern commercial applications that emerged afterward.

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Jeep vehicles (originally the Willys MB)
Nescafé instant coffee (developed for military rations)
Ray-Ban aviator sunglasses (designed for Air Force pilots)
Sonar systems (originally called ASDIC)