Great guide, but not sure the gray guys heal 'others'. There are Operatives (dual guns), Engineers(Glow Wand), and Commandos (With the big gun). Targeting is the way to go, but I would say Engineers First (They heal others) -> Operatives (Easy to kill but dangerous to have around) -> Commandos (Take the longest to kill, but it is a LOT faster if the Engineer is dead, and a LOT safer if the Operatives are dead).
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