U.S. Marines with 2nd Battalion, 1st Marine Regiment,

U.S. Marines with 2nd Battalion, 1st Marine Regiment, 1st Marine Division, clear the outside of a building during an Air Raid Course at Marine Corps Base Camp Pendleton, California, Dec. 12, 2018. The Marines were being observed by the Expeditionary Operations Training Group to enhance their tactics, techniques, and procedures applicable to raid operations for future deployments. (U.S. Marine Corps photo by Lance Cpl. Alexa M. Hernandez)