Which famous military leader served as an unofficial but highly effective 'brand ambassador' for the Colt revolver during the 19th century, significantly boosting its adoption in military circles?

Throughout history, military equipment manufacturers and suppliers have used various marketing strategies to promote their products to governments and armed forces. Some have employed famous military figures as brand ambassadors to enhance credibility and appeal. This poll tests your knowledge about one of the most famous historical brand ambassador relationships in military industrial history.

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General George Armstrong Custer, whose public praise after the Civil War helped establish the Colt Single Action Army as the 'Peacemaker'
Samuel Walker of the Texas Rangers, who collaborated with Samuel Colt to create the Walker Colt and whose endorsement revived Colt's failing business
General Ulysses S. Grant, whose battlefield preference for Colt firearms led to their widespread adoption in the Union Army
Theodore Roosevelt, whose publicized use of Colt revolvers during his Rough Rider days created an enduring marketing narrative