From the NYT's "The Virus Underground" from February 8, 2004:
Paula Scalingi, the former director of the Department of Energy's Office of Critical Infrastructure Protection, now works as a consultant running disaster-preparedness exercises. Last year she helped organize ''Purple Crescent'' in New Orleans, an exercise that modeled a terrorist strike against the city's annual Jazz and Heritage Festival. The simulation includes a physical attack but also uses a worm unleashed by the terrorists designed to cripple communications and sow confusion nationwide. The physical attack winds up flooding New Orleans; the cyberattack makes hospital care chaotic. ''They have trouble communicating, they can't get staff in, it's hard for them to order supplies,'' she says...
In October 2004, Purple Crescent 2 was held:
What happens when terrorist or would be hackers attempt to disrupt communications infrastructure concurrent with a natural disaster taking place in or around the City of New Orleans, Louisiana? The effects of a large natural disaster are already devastating as we are seeing along the Gulf Coast after Hurricane Ivan made landfall. How much worse could it be if domestic or international terrorists attempted to impede preparations before the storm, or the recovery after the storm, by utilizing cyber-terrorism? All agencies, including government, law enforcement, EMS, public health, commercial banking, petro-chemical, and private enterprises are welcome to participate in this DHS monitored and supported exercise.