SAN CLEMENTE ISLAND, Calif. (Dec. 8, 2020) U.S. Marines and Sailors with 1st Battalion, 5th Marines, 1st Marine Division, board a landing craft, utility (LCU) during exercise Steel Knight/Dawn Blitz (SK/DB) 21 on San Clemente Island, Dec. 8, 2020. DB/SK21 ensures the 1st Marine Division/ESG-3 team is optimized for naval expeditionary warfare in contested spaces and is purpose-built to facilitate sea denial and assured access in support of the naval fleet. (U.S. Marine Corps photo by Lance Cpl. Cameron Rowe)