Carrol

Carrol was the President of the United States circa 1994. He gave the civilian biologist Joseph Rennigan the rank of Commander in the US Army during a White House ceremony. At the time, such a preferment was necessary, as only US Army personnel were allowed on American spaceflights. (PROSE: Rennigan's Record)

Behind the scenes

 * It's extremely difficult to rectify the existence of this president against other accounts, which establish different mid-1990s presidents, like the real-life Bill Clinton.