Which World War I recruitment poster campaign became one of the most influential marketing tools in military history and was later adapted by many other countries?

Marketing has played a crucial role in military recruitment throughout history. From ancient Rome's promise of land and citizenship to modern sophisticated multimedia campaigns, military organizations have used evolving marketing strategies to attract recruits. This trivia question examines a famous military marketing campaign that revolutionized recruitment in the early 20th century and became an enduring cultural icon.

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Uncle Sam's "I Want YOU for U.S. Army" poster featuring a pointing finger (1917)
Britain's "Keep Calm and Carry On" poster campaign (1939)
The "Be All You Can Be" U.S. Army slogan campaign (1980)
Soviet Union's "Motherland Calls" propaganda poster (1941)