In the second volume, XIII is captured by General Carrington, who confirms that XIII is Steve Rowland. Carrington further explains that Rowland was a member of a special ops unit called SPADS (Special Assault and Destroying Sections). Carrington had been commander of SPADS when Rowland was supposedly killed in a helicopter crash two years earlier. Because XIII's amnesia prevents him from identifying who sponsored the President's assassination, Amos lets him go.
Rowland
Amos