U.S. Marines with 3rd Littoral Combat Team, 3rd Marine Littoral Regiment, 3rd Marine Division, conduct Range 400, a company-level combined arms training event, during Marine Littoral Regiment Training Exercise at Marine Corps Air Ground Combat Center Twentynine Palms, California, Feb. 9, 2023. MLR-TE is a large-scale, service-level exercise designed to train, develop, and experiment with the 3rd MLR as part of a Marine Air-Ground Task Force, led by 3rd Marine Division, operating as a Stand-in Force across a contested and distributed maritime environment. - U.S. Marines with 3rd Littoral Combat Team, 3rd Marine Littoral Regiment, 3rd Marine Division, conduct Range 400, a company-level combined arms training event, during Marine Littoral Regiment Training Exercise at Marine Corps Air Ground Combat Center Twentynine Palms, California, Feb. 9, 2023. MLR-TE is a large-scale, service-level exercise designed to train, develop, and experiment with the 3rd MLR as part of a Marine Air-Ground Task Force, led by 3rd Marine Division, operating as a Stand-in Force across a contested and distributed maritime environment.