Which innovative supply chain system, developed during WWII, used standardized packaging to efficiently deliver supplies to front-line troops?

During World War II, logistics and supply chain management became critical factors in military success. One particular innovation revolutionized how troops were supplied in the field, dramatically improving combat effectiveness. This logistical breakthrough represented one of the most significant advances in military retail supply systems and continues to influence modern military logistics and even civilian supply chain management to this day.

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The K-ration system
The Red Ball Express
The CONEX (Container Express) system
The Mulberry harbor system