Which wartime packaging innovation was specifically developed for D-Day in 1944 and later revolutionized civilian food preservation?

During major conflicts throughout history, product packaging evolved dramatically to meet military needs. From K-rations to MREs, packaging innovation has been crucial for troop support and often led to civilian market breakthroughs. Test your knowledge about how military necessity drove product packaging evolution that later influenced civilian markets and changed how products were presented, preserved, and transported worldwide.

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DUKW waterproof cardboard containers
SPAM's key-opened tin can design
The Combat Ration WAXPAK preservation system
Bakelite hermetic sealing technology