Three men have claimed the mantle of Union Jack in mainstream continuity. The first is Lord Montgomery Falsworth who worked for the Allies in World War I. He performed guerrilla activities against the German Forces. The Second is his son Brian Falsworth who took up the identity during World War II. He was provided a variant of the Super Soldier Serum which allowed him to perform at the peak of human potential. The third was not a member of the Falsworth family but a working class man, Joseph Chapman, who was offered the mantle by Brian Falsworth. Chapman now serves as the current Union Jack working with the New Invaders.