Medics are a type of flying drone utilized by both the Autobots and the Decepticons. Their primary function is to generate a repair field that heals allied units within their range, however they also have defensive capabilities in the form of plasma weapons. They can be taken down with a good solid blow, but explode when destroyed. It's generally a good idea to take them out before attacking the enemy they're supporting.
Medics were employed as support by both sides during the Great War.