U.S. Marines with Kilo Co., 3rd Battalion, 5th Marine

U.S. Marines with Kilo Co., 3rd Battalion, 5th Marine Regiment, 1st Marine Division, post security during an air assault as part of Steel Knight/Dawn Blitz (SK/DB) 21 at Naval Air Facility El Centro, California, Dec. 7, 2020. Strong, mutually supporting relationships between 1st Marine Division, I Marine Expeditionary Force units, and naval units are enhanced by large combined-arms exercises like SK/DB 21. (U.S. Marine Corps photo by Sgt. Miguel A. Rosales)