Which military-inspired retail marketing innovation from WWII fundamentally changed how Americans shopped for groceries?

The military industrial complex isn't just about weapons and vehicles - it's also created some of history's most innovative marketing campaigns and consumer products. From war bonds to recruitment posters, military organizations have pioneered advertising techniques that later influenced civilian marketing. This trivia question explores a fascinating crossover between military history and retail marketing that changed consumer behavior in America.

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Self-service supermarkets (shoppers selecting their own items rather than requesting from clerks)
Ration stamp books (creating the first loyalty rewards program model)
Victory garden seed catalogs (pioneering mail-order retail for home consumers)
War bond purchasing counters (establishing the department store credit system)