Which packaging innovation was specifically developed during WWII for military use but later revolutionized civilian food preservation?

Throughout military history, packaging design has played a crucial but often overlooked role in warfare success. From preserving rations to protecting ammunition, military packaging innovations have directly impacted battlefield outcomes. This poll tests your knowledge of how military packaging design evolved to meet specific wartime challenges and how these innovations later influenced civilian product packaging.

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Vacuum-sealed cans with pull tabs
MRES (Meals Ready to Eat) in retort pouches
Freeze-dried food technology
Tin cans with corrosion-resistant linings