This year, U.S. Cyber Command celebrated its tenth birthday. It has much to celebrate: It achieved the status of a unified combatant command, its budget is healthy, and its commander, Gen. Paul Nakasone, is popular on both sides of the aisle. Nakasone’s more aggressive posture in cyberspace — what the command calls persistent engagement — has won the support of policymakers and legislators who wanted to see action against those who had been targeting U.S. interests. Before, U.S. cyber forces had shown restraint even in the face of repeated cyber attacks. Now, they will reach out into cyberspace to discover and mitigate threats before they could reach U.S. networks and damage U.S. interests.