been doing it for some time now....

America prepares for 'cyber war' with China

All of America's foes, including Iran, are looking at ways of hacking into US networks to glean trade and defence secrets.
[link to www.telegraph.co.uk]
He said America's nerve centre "resides in cyberspace. Our military command and control, and precision strike capability all rely on ensured access to the electronic spectrum."

Caitlin Harrington, an aviation specialist at Jane's Defence Weekly, said: "The US military is taking this very seriously. It is similar to the once-emerging question of dominance of outer space."