Ashton Carter: The Pentagon Must Think Outside of Its Five-Sided Box

The thing is, cyber capabilities and vulnerabilities are things our potential adversaries are very focused on. They work to steal industrial and technical secrets. They work to find ways to intrude and disrupt our networks. And they work to use those abilities to further their interests if push comes to shove. We hold a decided technical and capability advantage; our enemies seek to negate that via cyber means.
Some of those capabilities have been demonstrated. Recent disruptions to electrical and communications infrastructure are very likely the result of this. Internet went down in Aleppo. Power grid went down in Kiev. And this is just a "field test" against fairly unsophisticated targets. Think of what a disruption to Wall Street, cellular systems, GPS, or banking infrastructure would do. Our enemies know.

I have long personally advocated that we go a bit older school and use our jamming capability offensively. Watch ISIS try to communicate, recruit, and coordinate in the dark. Enough power pushed through those systems can permanently disable electronic devices.