Which wartime marketing strategy, originally developed for military purposes in WWII, later revolutionized civilian retail by introducing the concept of 'planned obsolescence'?

Throughout military history, certain retail and marketing innovations emerged directly from wartime necessity, forever changing how products are sold and distributed. From K-rations to military surplus stores, the relationship between military needs and retail evolution has been significant. This trivia question explores a pivotal marketing strategy born during a major conflict that revolutionized retail beyond the battlefield.

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The 'Buy War Bonds' campaign that created the modern loyalty program model
The military's standardized sizing system that became the foundation for modern retail clothing sizes
The annual model change strategy pioneered by the military equipment manufacturers that later transformed the automotive industry
The military PX (Post Exchange) system that became the template for modern department store layouts