Which product design innovation introduced to military PX stores during WWII had the greatest impact on troop morale and is still influential in military retail today?

The Post Exchange (PX) system has been a cornerstone of military retail for over a century, providing soldiers with access to goods and a touch of home while deployed. During major conflicts, these retail innovations significantly impacted troop morale and military effectiveness. This poll tests your knowledge about a revolutionary product design change implemented in military retail during WWII that fundamentally changed how soldiers accessed familiar brands.

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K-ration branded packaging that featured hometown imagery of American landmarks
Pocket-sized versions of popular civilian products (cigarettes, candy, toiletries) in waterproof packaging
Color-coded retail sections based on military rank and service branch
Personalized dog-tag scanning system for tracking soldier purchasing preferences