Which military merchandising campaign is widely considered the most successful retail recruitment tool of the 20th century?

Throughout history, military organizations have created branded merchandise that evolved from practical recruitment tools to collectible memorabilia. This phenomenon represents a fascinating intersection of military history and consumer psychology, showing how armed forces have used merchandise to build loyalty, create cultural identity, and establish lasting connections with the public. Test your knowledge about this unique aspect of military retail history!

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The U.S. Army's "Uncle Sam Wants You" posters and related merchandise (1917-1918)
The Soviet Red Army's "Defend the Motherland" collectible series (1941-1945)
The British Royal Navy's "Join the Navy and See the World" campaign products (1939)
The German Wehrmacht's "Strength Through Unity" merchandise line (1935-1939)