Origin of U.S.Agent aka John Walker | New Captain America Falcon and The Winter Soldier

U.S. Agent (John Walker) is a fictional superhero appearing in American comic books published by Marvel Comics, usually those starring Captain America and the Avengers. He first appeared in Captain America #323 (November 1986) as Super-Patriot. He was later redesigned as a new incarnation of Captain America and, a few years later, as U.S. Agent.
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