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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[quote]completely removing areas of a planet[/quote] Even if this were a viable tactic, there is a limitation (or 'bandwidth') on the things that can be in-transit through slipspace at once. If immense amounts of mass are transported over large distances (I daresay that a chunk of a planet would suffice for this description), slipspace travel becomes slower and journeys require shorter individual jumps. This was shown in Silentium when slipspace was completely worn out due to the Master Builder constantly transporting the Halos around. Having large chunks of planets moving through slipspace wouldn't be a particularly smart move if similar consequences were to be suffered.