Which packaging innovation, first widely deployed during World War II, revolutionized military field rations by allowing individual meals to be preserved without refrigeration for extended periods?

Throughout military history, the packaging of combat rations has evolved dramatically to meet the unique demands of warfare. From the simple waxed cardboard of early C-rations to modern MREs (Meals, Ready-to-Eat), packaging technology has been crucial for preserving food, maintaining morale, and ensuring operational readiness in extreme conditions. This trivia question explores a groundbreaking packaging innovation that revolutionized how soldiers received nutrition on the battlefield.

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The KANGEE pouch (Kevlar-Aluminum Nitrogen-Gassed Environmental Enclosure)
The retort pouch (flexible packaging that could be heat-processed like metal cans)
The Mylar vacuum seal (polymer-based atmospheric containment system)
The Permafrost container (chemically-cooled preservation chamber)