Which military food packaging innovation from WWII revolutionized civilian food retail and is credited with changing how products were marketed to consumers after the war?

Throughout military history, the packaging and delivery of food to soldiers has been crucial for maintaining morale and fighting capability. From ancient preserved foods to modern MREs (Meals Ready to Eat), military food packaging has driven civilian food preservation innovation. This trivia question explores how product packaging development in military contexts has influenced broader consumer markets and retail strategies.

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K-rations in waxed paperboard boxes
Dehydrated food in moisture-proof packets
Self-heating meal cans
SPAM in key-opened tin cans with long shelf life