Nightfall? Hm, pretty good.

Bungie.net : Halo: Reach Forum : *I3utteRzZ's Onyx-MAX Campaign Commendation Guide*

I'll Explore with Liberty in the future and come up with a way to make grunts spawn right in front or you perfectly so you could just spray your pistol and kill them fast, or, I'll try.

I'm almost to 400,000 (=
I need, I think 15,000 More.. which could be made easily in an hour or two.

Yup, 300,000+ Campaign Kills and going strong!

Noble