Which iconic consumer product was originally designed for military use in WWII before being repositioned as a household brand?

Throughout history, military conflicts have influenced consumer products in unexpected ways. From technological innovations to marketing strategies, the military-industrial complex has shaped what we buy and how it's positioned. This trivia tests your knowledge of how military history intersects with consumer product development and brand positioning that many people encounter in their daily lives without realizing the martial origins.

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Jeep vehicles - originally designed as a general purpose vehicle for the US Army before becoming a civilian brand in 1945
Ray-Ban sunglasses - first created as tactical equipment for bomber pilots before being marketed to civilians
Tupperware containers - initially developed for preserving military rations before being repositioned for home food storage
Zippo lighters - first commissioned by the US military as windproof lighters for troops before becoming a civilian staple