Which WWII aircraft manufacturer's advertising campaign featured the slogan 'Keep 'Em Flying' that later became a national war effort slogan adopted by the U.S. government?

During major conflicts throughout history, military equipment manufacturers have created memorable advertising campaigns to promote their products, secure government contracts, or boost public support. These campaigns often reflected the patriotic sentiment of their times while showcasing technological innovations. Test your knowledge about these historic military product marketing efforts that shaped both public perception and procurement decisions during crucial periods of military history.

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Curtiss-Wright Corporation
Boeing Company
Lockheed Aircraft Corporation
North American Aviation