The US government replaces Steve Rogers as Captain America with John Walker.
Captain America #333 – The Replacement released by Marvel on September 1, 1987
Captain America #334 – Basic Training released by Marvel on October 1, 1987
John Walker had his strength enhanced in hopes of being a hero for his country like his fallen brother. After a tenure upholding the mantle of Captain America, Walker re-established himself as U.S.Agent where he went on to have extensive service as a member of, and even leader to, the Avengers.