Which groundbreaking military recruitment marketing campaign of the early 20th century was the first to use psychologically-targeted messaging based on market research?

Throughout history, military forces have employed sophisticated marketing strategies to attract recruits, build public support, and project power. From ancient Rome's symbolic eagles to modern digital campaigns, these tactics have evolved dramatically while maintaining core psychological principles. Test your knowledge about a pivotal military recruitment campaign that revolutionized how armed forces marketed themselves to potential recruits and the general public.

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Lord Kitchener's 'Your Country Needs You' poster campaign (UK, 1914)
The 'Join the Army, See the World' campaign (US, 1920s)
Germany's 'Strength Through Joy' military readiness program (1933)
The Soviet Union's 'Ready for Labor and Defense' campaign (1931)