Video by Sgt. Matthew Wantroba Player Embed Code: <iframe width='500' height='300' scrolling='no' frameborder='0' style='border: none; overflow: hidden; width: 500px; height: 300px;' allowtransparency='true' src='https://www.dvidshub.net/video/embed/991297'></iframe> Download Embed Share A Day in the Life, Patrolling the Southern Border Department of War Southern Border Dec. 10, 2025 | 2:05 U.S. Marines with 3rd Battalion, 4th Marines, assigned to Joint Task Force-Southern Border (JTF-SB), patrol along the southern border barrier in San Diego, Calif., Dec. 10, 2025, part of JTF-SB's support to U.S. Customs and Border Protection (CBP). JTF-SB executes full-scale, agile, and all-domain operations in support of CBP to protect the territorial integrity of the United States and achieve 100% operational control of the southern border. (U.S. Army video by Sgt. Matthew Wantroba)