Which innovative packaging technique, originally developed for military rations in WWII, revolutionized retail food preservation and was later adopted by civilian food companies?

After major conflicts like WWII and Vietnam, military surplus became a unique retail phenomenon with fascinating marketing and customer retention strategies. The transformation of military gear into civilian products represents one of history's most interesting case studies in retail adaptation. Test your knowledge about how war materials found new life in civilian markets and the innovative retail strategies that developed around military surplus.

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Vacuum sealing technology
SPAM canning process
Freeze-drying preservation
Tin foil wrapping