Such an animal visited our fair city Tuesday: The courthouse was bombed (and an unexploded IED was found at the site), as was an academic building at the alma mater and hostages were taken at the college's theater.
From scanner traffic, first responders seemed to be floating in a sea of crises, but they apparently did OK. I question whether drills such as these provide adequate preparation. It seems to me that more repetition is needed than can be provided.
But I guess if Osama rolls into town, we'll be somewhat ready :)