Which packaging innovation, first widely implemented during WWII, revolutionized military field rations by improving preservation and portability while significantly reducing weight?

Throughout military history, the packaging and design of field rations have been crucial to soldier effectiveness and morale. From ancient preserved foods to modern MREs (Meals Ready to Eat), the evolution of military rations represents one of the most important yet overlooked product development stories. This poll tests your knowledge about a significant packaging innovation that revolutionized how soldiers received nutrition in combat zones, dramatically improving field logistics and combat readiness.

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The K-Ration's waxed cardboard boxes with cellophane-wrapped components
The C-Ration's steel tin cans with pull-tab opening mechanism
The D-Ration's aluminum foil wrapping with moisture-resistant coating
The P-Ration's vacuum-sealed glass containers with rubber gaskets