""One of those tools was Stuxnet, a computer virus jointly
developed by the United States and Israel that damaged nearly 1,000 centrifuges
at an Iranian nuclear plant in 2010. If an adversary should turn a similar virus
against U.S. computer systems, whether public or private, the government needs
to be ready to preempt or respond, officials have said. Since the creation of
the military's Cyber Command in 2010, its head, Gen. Keith Alexander, has
forcefully argued that his hundreds of cyberwarriors at Fort Meade should be
given greater latitude to stop or prevent attacks.""