I picked up some assorted HOF Humanity minis a few weeks back. Surprisingly, the Post Apocalyptic Warriors and Rim Mercenaries became my instant favorites once I saw them in person. They are somewhere between Death Korps of Krieg and Pig Iron Productions in 15mm... very good minis. The gas masks open them up to quite a few environments and scenarios. I think in the Conquest System they are going to be militant rebels formerly assigned to a mining facility.
I painted up one of each gas mask sculpt, just to see what they would look like:
I think they turned out rather well. :)