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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1) the damn things are REALLY rare and incredibly expensive 2) they have these things (mentioned in the books) called planet killers which are basically 1 gigaton fusion bombs 3) they don't use slips pace bombs or for that matter planet killers (to the best of our knowledge) because they are easily intercepted by covy point defenses.