This video that I made teaches you how to walk around without any weapons in the Halo Reach Beta.

[ame=https://www.youtube.com/watch?v=kVqhyctgf2Q]YouTube - Halo Reach Beta Glitches - No Weapon - Weaponless Character[/ame]

This is pointless, and not useful at all in the beta unless you set up a game full of your friends so you don't have people running around killing you.