Which WWII-era aircraft manufacturer's brand positioning strategy centered around the slogan "Keep 'Em Flying" and became so recognizable that their P-51 Mustang fighter remains one of the most identifiable military aircraft brands?

Military equipment manufacturers have long established distinct brand identities to position themselves in government procurement contracts. Throughout history, certain brands became synonymous with military might and technological advancement. This poll tests your knowledge of how historical military equipment manufacturers positioned their brands and the recognition they achieved during major conflicts.

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North American Aviation
Lockheed Corporation
Grumman Aircraft Engineering Corporation
Republic Aviation Corporation