The Defense Department is taking additional steps to shield its computer networks against hackers and terrorists but it also must defend itself from insiders, lawmakers were told Thursday. The Department is increasingly dependent on a "global information environment" over which . . .

The Defense Department is taking additional steps to shield its computer networks against hackers and terrorists but it also must defend itself from insiders, lawmakers were told Thursday. The Department is increasingly dependent on a "global information environment" over which it has little control, said Linton Wells, an acting assistant defense secretary. That dependence increases U.S. vulnerability to threats externally - and internally.

"Increasingly, we see that we have to be able to guard against the inside - the Ameses and the Hanssens," he said, referring to veteran intelligence agents accused of espionage.

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