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Tactical Support Squad
From Warhammer 40k - Lexicanum

Tactical Support Marine with Rotor Cannon
Tactical Support Squads were a type of Space Marine Legion squad used during the Great Crusade and Horus Heresy era.
These mobile fire-support units replaced their standard Bolters with more specialized weapons such as Rotor Cannons, Volkite Culverins, Plasma Guns, Flamers, and Melta guns. Tactical Support Squads operate in close order with their respective Legion's other troops, their supporting firepower enabling a Space Marine force to act with even more versatility and engage a wider range of targets on its own terms.[1]
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