This was the only thing I could find in the thread you indicated that seemed related:
COndition Orange! wont be shooting personal "fun" firearms for a while anyway.
This, I think, might refer to the fact that the author is perhaps a police officer, military or some other kind of first responder who would be called who to work added shifts, etc.
Or maybe it is a joke that he thinks he will be shooting "serious" firearms because of the code orange.
In any case, the Homeland Security Office codes are binding on the Federal government and suggested states for local governments.
Again, please don't give the gun-grabbers ideas. In Maryland, the deer hunting season was suspended because of the D.C. sniper. Air heads were calling the police because there were people in camo in the woods! Mercy! These were, by the way, bow hunters.