Before the Costumes

John Walker idolized his brother Mike, who died serving his country during the Vietnam war. After Walker served his own time with the military, he eventually gains his superhuman abilities from the Power Broker.

Once he had his powers, Walker needed to repay his debt to the Power Broker. He initially wrestled in the Unlimited Class Wrestling Federation, where super powered individuals regularly competed such as the Thing and She-Hulk.

As Super-Patriot

He eventually decided to leave the wrestling world to take up crime fighting.

Taking the identity Super-Patriot, he became a corporate sponsored Hero. Walker set himself up in opposition to Captain America claiming the title should be given by the people to the person most worthy.

Behind the scenes, the Red Skull had slowly maneuvered Steve Rogers into conflicts with the government's Commission on Superhuman Activities in an attempt to drive him out of his role as Captain America. When Steve Rogers abandoned the role, Valerie Cooper invited Walker to take over as Captain America.

As Captain America VI

As Captain America, Walker received training from the Taskmaster. It was from the Taskmaster that Walker gained his competency with the shield and fighting style of Captain America. However, he lacked the moral fiber Steve Rogers possessed.

The Red Skull wanted a figure in the Captain America uniform that would tarnish the image Steve Roger's had taken a lifetime to uphold. Walker's time as Captain America

very nearly succeeded in bringing the Red Skull's vision to fruition. His parents were killed by a group known as the Watchdogs, one of the groups secretly run by the Red Skull. This drove Walker to the edge, and he began a steady streak of murder. He massacred many Watchdog members and ended several missions with fatal results.

Walker eventually fought Steve Rogers, who temporarily took the name The Captain in his continued fight for justice. The two fought, and eventually The Red Skull's plan was revealed. Walker realized the he could not be the type of man necesary to wear the Captain America uniform and asked Steve Rogers to take back his rightful uniform.

Later Career

Walker returned to crime fighting in his own fashion, were he evolved into the US Agent. The US Agent costume was based on Steve Rogers' Captain uniform in honor of Captain America. His costume was complete with his own Vibranium shield.

During this stage of his career, Walker has been added to the roster of several superhero teams. Over the years he has served faithfully as a member of the Avengers West Coast, Force Works, The Jury and recently he has been in the latest incarnation of the Invaders.

With the short lived Invaders series over, U.S. Agent has joined Omega Flight in Canada in order to hunt down the Purple Man.

Powers and Abilities

U.S.Agent possesses superhuman strength on par with Spiderman. he also possesses superhuman endurance as well as olympic class gymnastic skills. U.S.Agent is an excellent fighter learning Captain America's fighting style from the Taskmaster. He is a combat veteran with military combat experience in tactical and strategic planning and observations, special operations, and is highly proficient in the use of conventional firearms. He uses his shield defensively and as a weapon throwing it with great accuracy due to his superhuman strength. At one point he used wrist guards which produced an energy shield as well as energy blast.

Alternate Realities

Earth-398

John Walker of Earth-398 was known as Liegeman and was a member of the Queen's Vengeance.