The Crimson Fists, while mighty indeed are still a chapter well below full strength. So they're going to need support. So we call upon the Imperial Guard. Here's some of the new stuff that I've got my eye on. The Command Squad looks awesome and according to GW, the sprue comes chock full of option including respirator masks (now that I spent $30 on FW heads). But it will be nice to see them in plastic.
I'll start with a single platoon with a command section and 2 infantry squads.