Which innovative product packaging technique was first developed for military MREs before becoming widely adopted in civilian food products?

Military Meals Ready-to-Eat (MREs) have evolved dramatically over time, becoming a significant product innovation in both military and civilian markets. The packaging, preservation techniques, and consumer insights gathered through their development have influenced numerous commercial food products. Test your knowledge about this unique intersection of military history and product development!

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Retort pouches (flexible packaging that can withstand thermal processing)
Vacuum-sealed plastic wrap (Saran wrap)
Pull-tab aluminum cans
Aseptic cardboard cartons (like Tetra Pak)