ORA and INU, I cannot think of any decent full names for. SRB I thought of earlier, but again, couldn't find a decent name. However, I do like:

IFA - International Fraggers Anonymous.
GAG - Grab a Gun.

I prefer IFA to GAG I think. Having said that, IFA doesn't "look" as good as GAG (picturing at the end of people's names). Hutch, WGU sounds a little weird. Any more ideas?