On the Bay City oddjob mission where you make the giant transmitter on the tower 'contacting home' I think it's called, instead of destroying the tanks, just pick them up with the abducto beam as they spawn and drop them upside down, they can't shoot the tower and no more spawn. Whatever you do, DONT DESTROY THE FLIPPED TANKS!! Or throw them in the water, or else they will respawn. Then just sit back and avoid getting shot down yourself.
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