U.S. Agent

"'A word of advice then. Stay the hell out of my way.'""―John Walker to Falcon"Jonathan F. "John" Walker is a super soldier and a Captain of the U.S. Army's 75th Rangers Regiment. A highly decorated U.S. soldier, Walker was chosen by the U.S. government to succeed Steve Rogers as Captain America when Steve briefly retired after not agreeing with the government's ideals. It was in this time when the government supplied John with a version of the Super Soldier Serum. This serum was only experimental however, leading to Walker slowly becoming more violent and psychotic. His aspirations of living up to Rogers' legacy did not play through as after Walker was seen being more of a violent figure, killing certain villains in public, he was stripped of the Captain America title and given a dishonourable discharge from the military working for the government.

However, the US Government later realised that Walker would still be a useful asset, even with his anger issues being caused by not only his Super Soldier Serum, but also his PTSD from war and his desperation to be like Rogers. It was then when the US Government gave him a new suit akin to his old Captain America suit as well as a new Adamantium Shield. This was when John Walker was dubbed the U.S. Agent.

Currently, Walker works as a United States Military Operative and Soldier, going on more dirty, special-ops missions for the government. He is sent on missions of both violence and sometimes is given a licence to kill on these missions. Walker is still as violent and psychotic as ever, which is why the US Government still keep a close eye on him and keeping a close eye on him and making sure he checks in every day.