Which military innovation directly led to the development of a major retail packaging innovation that revolutionized food preservation and distribution?

Many everyday retail products and technologies we take for granted originated from military research and development. The crossover between military innovation and commercial retail has shaped product development, packaging, and distribution strategies throughout history. Test your knowledge about how military advancements have influenced modern retail products and strategies!

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Canning technology, developed in 1809 for Napoleon's army to preserve food for long campaigns
Plastic wrap, invented during WWII as a waterproof covering for military equipment
The cardboard box, created in the Civil War to transport ammunition more efficiently
Freeze-drying, developed during the Korean War to reduce weight in soldiers' rations