The kid from Brooklyn
In Captain America: The First Avenger, Steve tries to enlist again and again and is always turned down for health reasons. Dr. Abraham Erskine sees something else in him: courage without any desire to hurt anyone. Steve gets the super-soldier serum and steps out of the chamber tall and strong. Minutes later, a HYDRA spy kills Erskine, and the formula is lost.
At first, the government uses Steve as a mascot in shows to sell war bonds. He only becomes a real soldier when he single-handedly raids a HYDRA base to rescue his friend Bucky Barnes and hundreds of prisoners. He forms a squad, gets the vibranium shield made by Howard Stark, and grows close to Agent Peggy Carter.
Bucky falls from a train in the Alps and is presumed dead. Steve fights the Red Skull on a plane loaded with bombs aimed at the United States and brings it down in the Arctic. Before the crash, he makes a date with Peggy to go dancing. He wakes up almost 70 years later, in New York.