Tactical drone

A tactical drone was a type of drone utilized by the Borg Collective. 

Appearance and specifications
In the 24th century, tactical drones possessed a tritanium infrastructure. 

In the 25th century, Borg drones were gray-skinned and hairless. Limbs, organs and chunks of body mass were exchanged with cybernetic implants. These drones wore no clothing, leaving skin exposed to the environment. 

A Borg prosthetic recovered from a tactical drone could be modified into a ground weapon, it could fire plasma bolt bursts as its primary attack and a heavy force plasma bolt in secondary mode. 

History
During their expedition to locate and study the Borg in the early 2350s, Federation scientists Erin and Magnus Hansen transported Three of Five, a tactical drone of Ktarian origin, to the USS Raven (NAR-32450) for examination. The Hansens discovered its tritanium infrastructure and tagged the drone to study its movements before returning 3 of 5 to his Borg cube. 

According to Seven of Nine in 2375, Hazari made excellent tactical drones due to their violent nature and advanced technical abilities. 

In 2409, tactical drones were among the Borg attacking Vega colony. 

From that time onwards, the powers that would form the Alpha Quadrant Alliance in 2410 cooperated to contain the Borg threat. 

Commander Khaiel N'Vek of the led a team of Tal Shiar officers aboard Cube 19721. The Borg awoke and attacked the team. 

On a mission to rescue scientists from Omicron Kappa II, the away team fought tactical drones before becoming embroiled in a three-way fight with the Undine. 

When an Allied team boarded a cube at NGC-4447, they found numerous tactical drones involved with creating an assimilated Undine. The team also recovered the Borg prosthetic of a tactical drone. 

During the Borg Invasion of Defera Prime, various Borg drones spread throughout the Defera battlezone, including tactical drones.

Alternate timelines
In an alternate timeline created by the KIS, the Borg assimilated Romulus. A former Tal Shiar base was swarming with drones, including tactical drones.