191207-M-ST406-1043 CAMP PENDLETON, Calif. (Dec. 7, 2019) U.S. Marines with Charlie Company, 1st Battalion, 1st Marine Regiment, 1st Marine Division, load a simulated casualty into an amphibious assault vehicle during exercise Steel Knight (SK20) at Marine Corps Base Camp Pendleton, California, Dec. 7, 2019. SK20 is an annual training exercise executed by approximately 13,000 Marines and Sailors designed to improve and asses the 1st Marine Division’s ability to fight and win against a peer or near-peer threat. (U.S. Marine Corps photo by Cpl. Ana S. Madrigal/Released)