HORUS HERESY: Special Weapon Upgrade SetTactical Support Squads replace the utilitarian bolter of their comrades with more specialised weapons, enabling a Legiones Astartes strike force to act with even more versatility and engage a wider range of targets on its own terms. Each of the armaments used by Tactical Support Squads has its place flamers are ideal for clearing bunkers, trenches, and urban zones, while rapid firing rotor cannons see use against hordes of lightly armoured foes.