Which innovative advertising technique was first widely deployed during WWII and later became standard practice in commercial marketing?

During major military conflicts throughout history, governments developed sophisticated advertising and propaganda campaigns to promote war bonds, recruitment, and civilian support. These campaigns often represented pioneering techniques in mass persuasion and market psychology that later influenced commercial advertising. Test your knowledge about how military history and advertising intersected during crucial wartime periods.

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Market segmentation targeting different demographics with tailored war bond messages
Focus groups to test propaganda effectiveness before mass distribution
Celebrity endorsements using military heroes in promotional materials
A/B testing of different poster designs in controlled geographic regions