Which packaging innovation, first widely adopted during World War II, revolutionized military field rations and later became a cornerstone of modern food preservation?

Throughout military history, packaging innovations have played a crucial role in preserving supplies, ammunition, and equipment in harsh battlefield conditions. From ancient armies to modern special forces, the evolution of military packaging has directly impacted operational capabilities and often meant the difference between success and failure. Test your knowledge about a revolutionary packaging innovation that transformed military logistics and field operations.

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SPAM cans with key-wind openers
Retort pouches (flexible packaging that could be sterilized with food inside)
Waxed cardboard K-ration boxes
Hermetically sealed tin cans with pull-tab lids