Which innovative packaging technique was first widely deployed for military rations during World War II, significantly improving food preservation for troops in the field?

Throughout military history, food packaging has played a crucial role in troop sustenance and morale. From the earliest tinned rations to modern MREs (Meals, Ready-to-Eat), military food packaging has been at the forefront of innovation, balancing preservation, portability, and practicality. This trivia question explores a groundbreaking development in military ration packaging that revolutionized how soldiers received nutrition in the field during a pivotal historical conflict.

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Freeze-drying technology
DEHYDI (Dehydrated) vacuum-sealed pouches
K-Ration waxed cardboard boxes
Self-heating aluminum containers