When you think that you have it all is the moment that you can lose it. Don't think ahead if you can't think for the present.
Okay, so I know the name is not too original, but it is what I would call it if halo ever released a melee sword weapon in the game. The hummingbird is exactly as it sounds, it hums to activation the moment the wielder holds it out for combat. I'm sure the UNSC would have found a way for spartans to do combat at hand to hand with the elites and the brutes by creating a melee weapon of their own. I have actually read in many types of science fiction that certain ultrasonic waves can actually disperse energy, and thus, a way to countermand the strike from ever reaching its target.
I know everyone says that it is impossible, but I believe that it is quite possible for that tech to be developed, but don't forget, humans are very innovative when they put their minds to it, unlike the covenent who only integrate weapons to their arsenal without a full understanding of it, as stated in the books, 'they are integrative, not innovative'.
[Edited on 09.02.2009 4:04 PM PDT]