Captain America: The Captain is the umbrella title used for the run of Captain America from issue 332 (cover dated Aug. 1987) to issue 350 (cover dated Feb. 1989), written by Mark Gruenwald. In this story arc, Steve Rogers (the original Captain America) temporarily gives up his superhero identity and is replaced by John Walker, before Rogers decides to return and has to fight Walker for the title.
The first issue in the storyline (#332) invokes the classic comic book story Spider-Man No More! with the tagline "Captain America No More!" on the cover. (The actual name of the issue is "The Choice.")
This issue also debuts the Commission on Superhuman Activities that would continue to make many appearances over the years, including in the famous Civil War comics storyline.