Tactical drone

From Memory Alpha, the free Star Trek reference

A tactical drone is a type of drone in the Borg Collective.

Members of Species 4228 make excellent tactical drones. (VOY: "Think Tank") Members of Species 6961 have also been observed as having been assimilated into tactical drones. (VOY: "The Raven")

Tactical drones have been noted to possess a tritanium infrastructure. (VOY: "Dark Frontier")