Which packaging innovation, introduced during WWII, revolutionized military field rations and is still influencing modern combat feeding systems today?

Throughout military history, innovations in product packaging have dramatically impacted battlefield effectiveness, logistics, and soldier survival rates. One packaging breakthrough in particular revolutionized how military rations were delivered to frontline troops, representing a significant advancement in military logistics and field nutrition. Test your knowledge about this crucial development that changed how armies feed their personnel in combat zones.

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K-Rations in waxed cardboard boxes
Retort pouches (flexible packaging that could be heated in boiling water)
Tin cans with pull-tab openings
Vacuum-sealed glass containers