Battlestar
When John Walker was chosen by the U.S. government to replace Steve Rogers as Captain America, he chose his old Army buddy Lemar Hoskins to serve as his partner. Lemar agreed, and with extensive training, became Battlestar.
After John gave up being Captain America (and became the U.S.Agent), Battlestar quit working for the government. He eventually joined Silver Sable and her band of mercenaries, the Wild Pack. He's still out there somewhere, filling the need for a quasi-patriotic super-strong super hero.
