MCB20

Marine Corps Base Twenty (MCB 20), known formally as the 20th Marine Corps Engineer Battalion, was originally activated during World War II to provide essential construction and combat engineering support in the Pacific Theater. The unit played a crucial role in building airfields, roads, and fortifications under combat conditions, enabling Marine and Allied advances on key islands. After the war, MCB 20 was periodically reactivated to support operations in Korea, Vietnam, and during various Cold War contingencies, adapting to new engineering technologies and mission requirements. Throughout its history, MCB 20 earned a reputation for innovation and resilience, embodying the Marine Corps’ ethos of “Improvise, Adapt, and Overcome” in both combat and humanitarian operations.