"Before September 11, 2001, the warning signs were there. We weren't organized. We weren't ready, and we suffered terribly for that lack of attention,” said U.S. Defense Secretary Leon Panetta recently. But in the battlefield of cyber space, “we cannot let that happen again. This is a pre-9/11 moment," he said. In this week’s “Policy Brief” segment, we'll take a closer look at U.S. efforts to protect itself from cyber attack: