Drone Elite (Bureau)
AKA, the "Minion Elite", this alien specialises in summoning Drones to assist his allies. Having a significant amount of health, and his drones capable of healing him and other aliens, he is a high-priority target, lest you find yourself overwhelmed by superior numbers. Luckily, killing him also destroys any of the Drones he's summoned (but not any Drones that have appeared independently). However, you'll need to do so quickly, especially in later missions, as his Drones will often stop and heal him.