When Defense Secretary Ashton Carter landed in Iraq for a surprise visit this week, he came armed with this news: More than 200 additional U.S. troops are headed to that country. They’ll join the fight to retake the Iraqi city of Mosul from the Islamic State. As that battle unfolds on the ground, a parallel war against ISIS is unfolding in cyberspace. U.S. officials have confirmed to NPR that over the past year, the cyber campaign has taken off. They describe an escalation in operations, from using cybertools to geolocate a particular ISIS leader to hacking into and then conducting surveillance on a particular computer.