Military networks are Pentagon's 'Achilles' heel'.

• Position: WASHINGTON PULSE

The Defense Department spends $2 billion a year on computer-network security, but nevertheless remains hugely vulnerable to cyber-attacks, says Deputy Defense Secretary Gordon England. The susceptibility of the Defense Department s networks to cyber-terrorism is the "single vulnerability" that troubles him the most, he tells an industry conference. The fast proliferation of digital information systems in the Defense Department--which do...