How did Steve Rogers become Captain America?

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Chris Evans as Captain America stands in costume holding his shield, with an American flag and sunlight in the background. — Captain America Chris Evans as the title character in *Captain America: The First Avenger* (2011), directed by Joe Johnston.

Steve Rogers became Captain America after volunteering to receive a top-secret serum. Originally a would-be army enlistee who was rejected by recruiters due to his small size, Rogers was transformed by the procedure into a "super soldier". Following this transformation, he adopted the persona of Captain America, wearing a red, white, and blue costume and carrying a matching stars-and-stripes shield to serve in the U.S. Army.1