Friend or foe missile
The Terran Knowledge Bank
The Friend or Foe Missile was a projectile weapon used by the Terran Confederation and Kilrathi fleets.
The missile locked on the nearest ship not broadcasting a friendly communications signal. As a result they could accidentally target friendly ships with damaged communications systems, including the ship firing the missile.
The Pilum FF was a Terran Confederation version of the missile. The Fang FF was a Kilrathi Empire version
Friend or Foe missiles were found on the Rapier II, Raptor, Venture, Krant and Jalthi. They were featured in both Weapons of the Terran and Kilrathi Fleets and Borger's All The Sector's Weapons Systems.