Marines Install Concertina Wire Along Yuma Border Barrier

Marine combat engineers with Combat Logistics Battalion 15, Combat Logistics Regiment 17, and 1st Marine Logistics Group used prefabricated brackets and concertina wire to repair and reinforce a section of the southern border barrier in Yuma on July 29, 2025, according to footage released by the Defense Visual Information Distribution Service. The one minute, 39-second B-Roll video, shot by Sgt. Mary Torres and posted August 7, documents the repair work carried out by Marines assigned to Joint Task Force-Southern Border.

The July operation was one piece of a larger military engineering push along the Yuma corridor. About 500 Marines from Camp Pendleton subsequently deployed to the area to expand barrier reinforcement, place signs, and conduct monitoring and detection along the border. The majority came from the 1st Combat Engineer Battalion, 1st Marine Division, augmented by personnel from various units across I Marine Expeditionary Force and II Marine Expeditionary Force.

The hands-on technical work has included training as well as installation. A photograph taken December 3 shows Cpl. Leonardo Partida, a combat engineer with CLB-15, teaching Marines from the 1st Combat Engineer Battalion how to prepare triple-strand concertina wire. The image, credited to Cpl. Noah Martinez, captures the inter-unit instruction that has characterized JTF-SB's approach to the barrier work in Yuma.

Camp Pendleton officials described the mission in direct terms: "Their mission is to improve security through activities such as reinforcing barriers, placing signs, and monitoring and detection." The base also drew a firm line around what the deployed troops will not do. "Military personnel are not authorized to conduct civilian law enforcement activities such as search, seizure or arrests," officials stated. To protect operational timelines, the Marines declined to say when Camp Pendleton personnel would be working in and around Yuma.

The deployments fit within a broader federal designation reshaping the legal and physical landscape along the Arizona border. Sections of land near Yuma have been classified as a National Defense Area under the Trump administration, a move that transfers land to the Department of Defense and creates a militarized zone where troops can detain individuals suspected of trespassing and turn them over to federal law enforcement. Those arrested can face federal trespass charges. The newest such zone covers Imperial County and the eastern portions of San Diego County, the administration announced in December.

JTF-SB describes its mandate as executing "full-scale, agile, and all-domain operations in support of U.S. Customs and Border Protection to protect the territorial integrity of the United States and achieve 100% operational control of the southern border." Such deployments to the Yuma area have become routine over the past year, with Camp Pendleton units cycling in to provide engineering and logistical support that CBP cannot supply on its own.