Which World War II military product launch featured the marketing slogan "Keep 'Em Flying" that became one of the most successful advertising campaigns of the era, helping to revolutionize aircraft production?

Throughout military history, certain product launches have dramatically changed warfare and captured public imagination through innovative marketing campaigns. These launches weren't just about introducing new technology but also involved sophisticated marketing strategies to gain government contracts, public support, and sometimes even influence wartime morale. Test your knowledge about one of the most successful wartime product marketing campaigns that revolutionized an entire industry.

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North American P-51 Mustang fighter aircraft
Boeing B-17 Flying Fortress bomber
Willys-Overland Jeep
M1 Garand rifle