Marine Support Battalion

The Marine Support Battalion (MSB) was established in 1955 to provide specialized signals intelligence (SIGINT) and communications support to the United States Marine Corps and joint military operations. Originally activated at Camp Lejeune, North Carolina, the battalion deployed detachments worldwide, offering critical intelligence collection and analysis during the Cold War, Vietnam War, and subsequent conflicts. In the 1990s, the battalion was reorganized, with its operational elements absorbed into the Marine Cryptologic Support Battalion (MCSB) under the National Security Agency. Throughout its history, the unit earned recognition for its vital role in enhancing situational awareness and supporting combat operations with timely, actionable intelligence.