On the table top, figure massed Artillery, Arrow Missiles, Cruise Missiles, Ortillery, or a nuke booby trapped drone mech. You are basically reducing a fortress at this point.
You might be able to get away with using a BV Balanced Massed swarm of bug mechs, 15k BV gets you a whole Battalion of Stingers, Wasps, or Locusts
In RPG Setting, it's just a giant building to gain access to and blow up. Don't think you are going to swarm a Rattler to death using TacOps rules, outside of sending multiple Ghost Bear Claws Clusters against the thing.