Player Embed Code: Download Embed Share B-Roll: U.S. Marines reinforce southern border wall to assist CBP with border security mission DoD Southern Border 2025 Jan. 27, 2025 | 4:32 U.S. Marines with 1st Combat Engineer Battalion, 1st Marine Division, reinforce the southern border wall near San Ysidro, Calif., Jan. 27, 2025. U.S. Northern Command is working together with the Department of Homeland Security with the emplacement of physical barriers to add additional security that will curtail illegal border crossings. (U.S. Marine Corps video by Cpl. Logan Courtright)