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Based on the description, More Dakka overlapping with Death from Above seems like the best fit. No Kill like Overkill or Damage Over Time might be involved depending on how much damage it does and how quickly it does it.
For completeness Camera Lock-On covers the control scheme/combat system that you'd use to circle strafe an enemy in a game, but wouldn't apply to a strategy game unit.
A combat maneuver where the attacker circles around the target and continuously fires at it. Sort of like the counterpart to Stationary Boss.
The specific example I'm looking to place is Red Alert 3's Harbinger, which has side-mounted guns that let it keep circling around a stationary target to pound it into dust (inspired by the AC-130 which does the same thing).