I shall fight for the greater good then! Or not, or maybe the God-Emperor is in fact the greatest good. It's hard for a mere foot soldier of the fire caste to be certain without higher-ups telling him.
In other words, I shall partake, I shall Tau, and I shall be ready. The only real question is if I want to be traditional and shoot from afar, or enter melee in some way. I suppose it would depend on what the people in charge give me since I don't have my base gear.