4th Combat Engineer Battalion

The 4th Combat Engineer Battalion is a unit of the United States Marine Corps Reserve, originally activated in 1943 during World War II. The battalion participated in the Pacific campaign, providing critical engineering support during the battles of Guam and Iwo Jima. Reactivated and reorganized several times over the decades, the unit has supported operations in the Gulf War, Iraq, and Afghanistan, excelling in mobility, survivability, and countermobility tasks. Today, the 4th Combat Engineer Battalion continues to serve as an essential engineering force within the Marine Corps Reserve, supporting both combat and humanitarian missions worldwide.