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A Long Range Torpedo (LRT) system is identical to a Long Range Missile launcher, but instead of flying through the air, missiles from this weapon swim through water.
No Streak or Narc versions of torpedoes are known to exist. No known special munition types are known to exist for torpedo launchers either. An Artemis IV FCS could be used with a torpedo launcher.
Since the LRT is based on the standard LRM system, it is available in the same sizes: