The best HALO Servers I've found.

[Colonel Mayo]

Operation Daybreak and Battlegroup Athens. Both are Halo Milsims.
They are full of good people and have a good structure. Lots of cool halo mods. No covenant yet, but I hear its in the works. Each of them has hundreds of active players and are mostly PvE, but have modded AI that is better than the vanilla AI. Lots of fun if you are a Halo fan.

Still havent seen a Warhammer server yet, but I'm keeping my fingers crossed.

[IC3D_ZOMBIE]

Thanks i didnt even know there was halo mods on reforger

[Colonel Mayo]

There are, and they are awesome.

[AxiumSA4]

I know for a fact some people are trying to do warhammer but I wouldn't expect it in a decent state until 4