The individual, having taken up a life of vigilantism as part of the Freedom Fighters, tried to stop the Führer's plans, only to be killed by him.
Expert hand-to-hand combatant/Martial artist: The man was an expert unarmed fighter, though he also used a shield for protection and as a secondary weapon. Despite his skill and equipment, he was unable to defeat the Führer. 
Protective armor: The man used a suit of armor, protecting his body from harm and his identity from being discovered.
Shield: The man used a specialized shield decorated with the flag of the United States that he used for protection and as a secondary weapon.
While the freedom fighter is never named (on-screen) his suit and physical likeness suggest that, like his Earth Thirty-Eight counterpart James Olsen, the man took on the superhero mantle of Guardian. This version has a golden helmet and shield, like the original comic book Guardian.