Captain Redeagle was one of the founding members of the Knights. Adored by the public, he was also called The Eagle-eyed Defender of Liberty.

Joseph Redeagle was an Apache. A self-made millionaire due to massive oil fields on his family's land, Redeagle proudly established a foundation in 1912 to help educate Native Americans. Pursuing his own love of flight which began as an ace pilot flying biplanes in World War I, the decorated Captain Redeagle started an airplane manufacturing firm in the Roaring Twenties, during the early days of aviation. He was an engineering and mechanical genius. His technological innovations proved so advanced that the United States government brought him into military planning as a top secret advisor. It was during this time that Redeagle first met Supreme Commander and worked alongside other superheroes developing secret projects. In World War II, Redeagle's superior designs, like the Hawkfire, Eagle's Claw, and the "Flying Fortress" B-17 Eagle, were used to give the Allies air power domination over Axis forces. Despite the government's wishes that he remain Stateside in order to protect their intellectual asset, Redeagle fought throughout World War II as a founding member of the Knights. His aircraft were used by the Knights in their globe-spanning missions, especially the B-17 Eagle, which served as their mobile headquarters.

Captain Redeagle died on August 9, 1945, flying his iconic B-17 Eagle, alongside his teammates attempting to stop the Crimson Dragon from detonating a nuclear bomb in Nagasaki, Japan.

A replica of his famous B-17 Eagle sits in front of the Smithsonian's National Air and Space Museum in Washington, DC. His uniform and goggled helmet with his iconic fathered headdress stand in the entrance chamber of the National Museum of the American Indian.

Joseph Redeagle's great grandson is Kai Redeagle, codenamed Talon.