Why didn't they? Couldn't a team of Spartan-II's escorting some naval personnel board a Covie Battlecruiser and capture it then allow the naval personnel to take control of it? Rinse and repeat.
I mean we all know that UNSC ships are garbage when facing Covenant ships. So they should've just captured Covie ships to level the playing field.
Would've been pretty effective in my opinion.
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Ye because a frigate can just go next to a cruiser and say "sup my home boys are just going to board your ass" instead it would get owned within 10 seconds of being within weapon range. Anything smaller and you won't have the numbers to take the ship. Unless you have Spartans, but if they can't guarantee the capture of a ship. oh and Spartans don't go grow on trees [Edited on 10.09.2012 9:12 AM PDT]