PACIFIC OCEAN (Dec. 4, 2020) U.S. Marines with 3rd Battalion, 5th Marine Regiment, 1st Marine Division, conduct an air assault rehearsal while aboard the amphibious transport dock ship USS Portland (LPD 27) as part of exercise Steel Knight/Dawn Blitz (SK/DB) 21 off the shore of San Clemente, California, Dec. 4, 2020. SK/DB 21 affords 1st Marine Division and Expeditionary Strike Group (ESG) 3 the opportunity to showcase readiness within the education, planning, and execution continuum. (U.S. Marine Corps photo by Sgt. Miguel A. Rosales)