A Cyber Command is being set up by the US Military to oversee efforts to protect its computer networks. A new headquarters for the unit is to be established with the responsibility of defending US military systems. The command will be capable of launching offensive operations against attacks from hackers. Pentagon officials have recently become more concerned about military vulnerability to computer encroachments. The US Department of Defence runs over 15,000 electronic networks and 7 million computers and technology devices. US defence networks are constantly probed by outsiders, with millions of scans every day from from terrorist groups, organised crime and hacker activists. The White House last month said another office would be set up to protect government and essential private networks.