Anti-ship guided missiles. Used in the SFU by the Kzintis, Klingons, and Federation (and some pirates) as secondary weapons. Most Kzinti ships have a lot of drone racks (missile launchers) and use the missiles to influence the maneuver of the enemy. Most Klingons have a pair of racks and use them to shoot down Kzinti drones or as opportunity weapons. The Klingon ships maneuver better than the Kzintis or Feds, so they don't need swarms of them to force the maneuver of the enemy. The Federation have special hybrid drone racks that can launch normal drones or "dogfight drones" that have a warp-seeking warhead which is good for shooting down drones or fighters. On the Romulan border, they mostly use standard drones, but on the Klingon and Kzinti borders they're likely to use more dogfight drones or "anti-drones".