Which packaging innovation was first widely adopted for military rations before becoming common in civilian retail products?

The evolution of military ration packaging represents one of history's most practical design challenges. From Napoleon's preserved food tins to modern MREs, packaging innovation has directly impacted battlefield effectiveness and soldier morale. This trivia question explores a breakthrough packaging technology that revolutionized how soldiers received nutrition during combat operations. Test your knowledge of where military necessity drove retail packaging innovation!

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Vacuum sealing (Retort pouches)
Aluminum cans with pull-tabs
Aseptic cardboard packaging (Tetra Pak)
Freeze-dried food packaging