Dressed in his black Ultimate Captain America-themed uniform, U.S. Agent is equipped with a pistol and his trademark shield. Idealizing his older brother, killed in Viet Nam, John Walker fixates on heroism. He is eventually introduced to the Power Broker, who supplies Walker with superhuman abilities. He becomes the Super-Patriot, publicly challenging Steve Rogers to a duel. When Rogers retires rather than work directly for the government, Walker is chosen as a replacement by the Commission of Superhuman Activities. Steve Rogers eventually returns as ‘the Captain’, clad in a black costume and equipped a Vibranium disk. When Rogers definitively defeats Walker and reclaims the Captain America mantle, Walker retrieves the Captain’s black costume and Vibranium disk, becoming U.S. Agent, operating on behalf of the Commission of Superhuman Activities. 

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