The Portsmouth was one of six Faslane-class Yardships to be constructed in secret between 2882 and 2949 by ComStar. In 3062 the CSV Portsmouth was a part of the Com Guard First Fleet based out of the naval base at Luyten 68-28. The CSV Portsmouth remained in service with ComStar as of 3067, but had been destroyed by 3076.
- Explorer Corps, p. 106, "Faslane Class Yard-Ship"
- Field Manual: ComStar, p. 44, "The WarShip Fleet"
- Field Manual: Updates, p. 83, "ComStar Naval Assets"
- Masters and Minions: The StarCorps Dossiers, p. 211, "The Com Guard: Key Military Commands"
- Catalyst Game Labs Ask The Writer Forum, Øystein, "All of ComStar's Faslane-class YardShips were destroyed by the Word of Blake."