U.S. Defense Department pleas to computer hackers to quit mischief-making appear to be falling largely on deaf ears, making spotting potential national security threats more difficult, a top Pentagon expert says.. . .
U.S. Defense Department pleas to computer hackers to quit mischief-making appear to be falling largely on deaf ears, making spotting potential national security threats more difficult, a top Pentagon expert says.

Despite recent appeals, "we're not seeing any diminishing" of the pace of attacks on Defense Department systems, on Tuesday said Richard Schaeffer, who heads the cyber-security office in the Pentagon arm responsible for command, control, communications and intelligence.

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