Laser guard

Laser guards are flying drones programmed to seek out and destroy the enemy. It's rare to find a laser guard on its own — they're usually dispatched in groups to attack unwary intruders. On rare occasions they may be used in an offensive, but for the most part assigned to patrol captured territory. As their name suggests, they're armed with a single nose-mounted laser. They're especially vulnerable to plasma weaponry.

Transformers: War for Cybertron (DS)
Laser guards were employed by both sides during the Great War.