U.S. Agent

U.S. Agent is a fictional character in American comic books published by Marvel Comics universe. 

 Fictional character biography 
His real name is John Walker, and he is a super-soldier who often operates as a government-sanctioned counterpart to Captain America. 

 In other media 
Known for his military background and patriotic demeanor, U.S. Agent has appeared in various comic book series and adaptations, including the Marvel Cinematic Universe (MCU), notably in the Disney+ series The Falcon and the Winter Soldier, and in the movies Thunderbolts* and Avengers: Doomsday, portrayed by Wyatt Russell.