Which consumer product was originally developed for military rations during WWII but became a massive commercial success after the war?

Throughout military history, feeding troops effectively has been as crucial as arming them. Combat rations have evolved dramatically from simple hardtack to modern MREs (Meals Ready to Eat). These products represent significant innovations in food technology, packaging, and nutrition science - often driving civilian food industry advancements. This poll explores the fascinating product history of military rations that have sustained forces across centuries of conflict.

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M&M's chocolate candies, designed to allow soldiers to carry chocolate without it melting
Tang powdered drink mix, created to provide vitamin C to troops in the field
SPAM canned meat, invented specifically for feeding Allied troops overseas
Nescafé instant coffee, developed to utilize Brazil's coffee surplus during wartime