U.S. Agent
REAL NAME: John Walker
GROUP AFFILIATION: Avengers West Coast

When a substitute for Captain America was needed, John Walker answered the call! And when the star-spangled Avenger returned to the fold, Walker adopted the costume Cap had worn during his leave of absence and became U.S. Agent! Given super-strength by the Power Broker and trained in all forms of combat by the notorious Taskmaster, the U.S. Agent does whatever is necessary to protect his country from any and all forces that might cause it harm!

In the beginning...
John Walker battled Captain America as the right-wing hero called the Super Patriot!