With cyberattacks soaring, corporations must step up efforts to protect their IT networks. Most firms could learn from the U.S. military, which has been tightening its cyberdefenses for the past six years. In this article the former vice chairman of the Joint Chiefs of Staff, a special assistant to the Joint Chiefs’ chairman, and a management professor describe the military’s approach and how business leaders can apply it in their firms. By taking charge, making everyone accountable, and instituting tough standards for IT training and operation, CEOs can embed these principles in their organizations and close critical gaps in security.