I'm sure we all remember that slipspace bomb hand delivered by Noble Team to the covenant supercarrier.
The clip has been included for your viewing pleasure.
http://www.youtube.com/watch?v=CefqJkb6ejc#t=1m21s
And no, I'm not linking it.
and I'm sure most of us are familiar that almost all UNSC ships have slipspace drives!
I don't see why the UNSC couldn't just strap a booster to a slipspace drive and start removing entire chunks off planets and supercarriers.
Spartans would be useless compared to the destructive power of completely removing areas of a planet and, for example, teleporting parts of a supercarrier into a sun.
Discuss.
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It doesn't have that much of an effect on planets. Look at New Mombasa for an example. The jump only took a few buildings.