Charles Grayson was a Centro Rear Admiral, then Admiral, who fought in both the Rim Wars and the Martian Revolution for the Centro Military. Grayson was a cautious and by-the-book commander who was notable both for his extreme competency and lack of creativity. Grayson gained the rank of Admiral after the death of Admiral Sandra Ng over Titan. He was in consideration to lead the assault on Tarkanograd that kickstarted the Siege of Tarkanograd, and the Martian Revolution, but lost the bid to Admiral Cornelia Carthage.