Steve Rogers has been a hero his entire life.
Captain America is one of Marvel's greatest heroes, and new lore reveals that he was a force for good long before he became a super soldier.
Captain America - Wikipedia
Steve Rogers (Marvel Cinematic Universe) - Wikipedia
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Marvel's Avengers face the new in May, with Captain America
Huge Captain America Lore Change Rewrites Origin & Source of
You're the Most Dangerous of Them All: Captain America Lore
Captain America (1990) - News - IMDb
Steven Rogers (Earth-616), Marvel Database
You're the Most Dangerous of Them All: Captain America Lore
Why does Captain America's costume change in all the movies? - Quora