The CWS Kal'sa was a Revenge-class battleship commissioned in the So'jan 1st Command Group. The ship was under the direct command of Supreme Admiral Da'note, with Colonel Val'gar serving as the ship's first officer. (Star Trek: Pioneer) In 2381, the construction of the Kal'sa was completed under the supervision of Commander L'mar and Tyson Calok. It was one of the first so'jan vessel to incorporate Romulan technology. The Kal'sa was later named the flagship of the So'jan armada. ("Prime Target")