U.S. Central Command
"In coordination with and at the invitation of the Kingdom of Saudi Arabia, the Secretary of Defense has authorized the movement of U.S. personnel and resources to deploy to Saudi Arabia. This movement of forces provides an additional deterrent, and ensures our ability to defend our forces and interests in the region from emergent, credible threats. This movement creates improvement of operational depth and logistical networks. U.S. Central Command continually assesses force posture in the region and is working with Kingdom of Saudi Arabia authorities to base U.S. assets at the appropriate locations."