Which retail innovation, first widely adopted during WWII, revolutionized military logistics by standardizing product packaging for combat supplies?

Throughout military history, retail innovations have dramatically altered how armed forces equip themselves. From the standard-issue equipment of ancient Roman legions to today's high-tech battlefield gear, the retail and logistics systems supporting military operations have evolved significantly. This poll tests your knowledge of a revolutionary retail innovation that transformed how modern military forces acquire and maintain critical equipment in the field.

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K-Rations in standardized packaging
The military PX (Post Exchange) system
The Standard Commodity Identification Number (SCIN)
The standardized shipping container (Conex)