The U.S. military can fight on land, in the air, at sea and in space. Now it has a strategy for operations in a new domain: cyberspace.
Under a new plan unveiled Thursday, the Defense Department said it is preparing to treat cyberspace "as an operational domain," with forces specially organized, trained and equipped to deal with cyberthreats and opportunities.
The strategy presumes that "cyberattacks will be a significant component of any future conflict" and that the United States must be prepared to retaliate, possibly even with military force.
"The United States reserves the right, under the laws of armed conflict, to respond to serious cyberattacks with a proportional and justified military response at the time and place of its choosing," Deputy Defense Secretary William Lynn said.
A cyberattack on the United States could prompt a military response under the Pentagon guidelines, however, only if it qualified as "an act of war," with effects comparable to those brought about under a traditional "kinetic" or physical attack, and it would be up to the president to make that judgment.