When it comes to specialist choice, it is important to consider the Game Mode you're playing. When in an objective-based game mode like Hardpoint or Domination, it may best to run a Lethal Specialist Such as the Tempest or Purifier, where in Search and Destroy, you may want to use a more Tactical Specialist such as Active Camo to get an easy bomb plant or even Vision Pulse to get a fairly easy round when in a clutch situation. Although specialist choice is left to a certain amount of preference, my favorite Lethal specialist is definitely the Tempest because of its ability to not only kill multiple enemies with a single shot, but its long range capabilities as well. My favorite tactical specialist would be the Overdrive because it gives such a distinct advantages in CTF and Uplink!