I am in no way affiliated with the site, I merely joined recently, but it is a nifty thing. I got in in on a team of 12 for Warzone last night and rolled wins out, 4 in a row. Which was way different and better than going solo. Just trying to share the goodness, plus if more people use it, it becomes more effective for all of us.
Here is a link: HaloLFG.com