The United States is being confronted by the liabilities of its strength. Competitors are finding avenues for threatening U.S. interests without triggering escalation. Their approaches lie in the contested arena between routine statecraft and open warfare-the "gray zone." The United States has yet to articulate a comprehensive approach to deterring competitors in the gray zone. A concrete and actionable campaign plan is needed to deal with the gray zone challenge; in order to do so, the United States must identify and employ a broad spectrum of tools and concepts to deter, and if needed, to compete and win contestations in the gray zone.