 U.S. Marines with 1st Battalion, 11th Marine Regiment, 1st Marine Division. Process Notional Fire Missions for an M-142 high-mobility artillery rocket system, during exercise Steel Knight 23.2 inches. At Marine Corps Base Camp Pendleton, California, December 5, 2023. Steel Knight is a three-phase exercise designed to train 1st Marine Expeditionary Force. In the planning, deployment and command and control of a joint force against, appear or near-peer adversary combat force. And enhance existing live-fire and, maneuver capabilities of the Marine Air Ground Task Force.