Which food preservation technology was first developed for military use before becoming mainstream in food retail logistics and dramatically extending product shelf life?

Food innovation has shaped our dining experiences and retail landscapes throughout history. While some revolutionary food technologies seem recent, many have fascinating origin stories that date back decades or even centuries. This trivia question challenges your knowledge about a pivotal food technology advancement that transformed how products reach consumers and influenced modern retail logistics in the food industry.

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Flash freezing (invented by Clarence Birdseye after observing Inuit preservation methods in Labrador)
Vacuum sealing (developed by Louis Pasteur while studying fermentation)
Aseptic packaging (created by Swedish dairy engineers initially for milk storage)
Modified atmosphere packaging (invented by British grocers seeking to extend produce freshness)