U.S. Marines assigned to Battalion Landing Team 2/4, 13th Marine Expeditionary Unit, participate in Assault Climbers Course 26-1, hosted by the Expeditionary Operations Training Group, I Marine Expeditionary Force, at Marine Corps Base Camp Pendleton, California, April 28, 2026. The Assault Climbers Course provides BLT 2/4 with specialized Marines capable of leading operations and providing tactical recommendations in complex, compartmentalized, and mountainous terrain. (U.S. Marine Corps video by Cpl. Grace Stover)