"Billions of dollars must be spent by both government and industry to improve security, said U.S. Rep. Dutch Ruppersberger of Maryland, the Democratic chairman of the intelligence subcommittee on technical intelligence."
This is unlikely without serious legislation and government regulation (see Commentary: U.S. CEOs to Assist in Critical Infrastructure Protection? - Not Likely).
The article goes on to quote U.S. Homeland Security Secretary Michael Chertoff:
"International law and military doctrines need to be updated to deal with computer attacks, Chertoff said.
"We know that if someone shoots missiles at us, they're going to get a certain kind of response. What happens if it comes over the Internet?," he said."
U.S. not ready for cyber attack