USMarines and #Sailors with 1st Marine Division, 3rd Marine Aircraft Wing, 1st Marine Logistics Group and Expeditionary Strike Group 3 conduct Dawn Blitz and Steel Knight (DBSK) 21 across Southern California, Exercise DBSK 21 provides effective and intense training in an expeditionary environment to ensure 1st Marine Division remains lethal, combat-ready, interoperable, and deployable on short notice. #USMarineCorps video by Cpl.