The 'Commander's SSD' (Ship System Display) was introduced. SSDs had just been a half-sheet diagram of the ship's systems. Some combined ship classes that were differentiated using shaded boxes which were to be ignored to represent the smaller ship class (for instance the Klingon D6 and D7 cruisers were presented on the same SSD sheet with shaded boxes indicating the phasers and shield boxes that the D6 lacked). The new Commander's style SSDs (which did not appear in "Volume I" or "II") took a full sheet and included extra record-keeping information, such as tracks for drone ammo and shuttles, and firing charts for all the weapons on the ship. A line of nine "" were produced, the first few of which were mostly involved presenting new-style SSDs for the older ships, the last several of which had all new material.