U.S. Agent is a fictional character, a comic book superhero in the Marvel Comics universe. He was created by Mark Gruenwald and Paul Neary in Captain America (vol. 1) #323 (November 1986).
U.S. Agent's early appearances included issues of Captain America and West Coast Avengers/Avengers West Coast. During the 1990s, U.S. Agent wore a discarded costume of Steve Rogers, the original Captain America, which was black and had a different alignment of the stars and stripes to differentiate it from Steve Rogers' original Captain America suit design.
Like some West Coast Avengers teammates who had their own series (Iron Man and Hawkeye in Solo Avengers), the character was popular enough to earn his own limited series in 1993. The mini-series was used to finish off a long-standing Marvel Universe plot thread involving the Scourge of the Underworld.
During the events of Maximum Security, U.S. Agent was given a new uniform reminiscent of riot police uniforms. He continued to use that uniform in his 2001 mini-series, which followed the events in Maximum Security and was written and drawn by Jerry Ordway.
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