Which packaging innovation, first widely adopted during WWII, revolutionized military field rations and later became common in civilian consumer products?

Throughout military history, feeding troops effectively has been crucial to battlefield success. From ancient Rome to modern special operations, combat rations have evolved dramatically in their packaging, preservation methods, and nutritional science. This poll tests your knowledge of how military food packaging innovation has shaped warfare capabilities and logistics. Do you know which revolutionary packaging technology transformed how soldiers were fed on the front lines?

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SPAM cans with attached key openers
Retort pouches (flexible packaging that can be heat-sterilized)
Freeze-dried food in vacuum-sealed packaging
The K-Ration's waxed paperboard boxes with cellophane inner wrappers