Which consumer product innovation, developed specifically for military use during World War II, later became a massive commercial success and is now a staple in households worldwide?

Throughout military history, the development of field rations has been crucial to battlefield success. From ancient armies carrying dried meat to modern MREs (Meals, Ready-to-Eat), the evolution of military food products reflects advances in food technology, logistics, and understanding of nutrition. This trivia question explores a famous consumer product innovation that revolutionized how soldiers were fed during one of history's most significant conflicts.

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Instant coffee (G. Washington's Prepared Coffee)
M&M's chocolate candies (designed to 'melt in your mouth, not in your hands')
SPAM canned meat product
Aerosol cans (used for insecticide delivery in the Pacific)