Today when I logged in, I noticed a new emblem on my profile, and I'm surprised that I have it.  Here it is:

Biological Warfare

I have no idea how I got this emblem, but if some of you other GSers' have an idea how and where it came, please tell me how I got this.  I'm not disappointed with it at all, as I'm very happy with a new emblem.  I just have the question of "When did this appear?"