3rd Engr Bn, 3rd Mar.Div

The 3rd Engineer Battalion (3rd Engr Bn) is a combat engineer unit that has served as part of the 3rd Marine Division (3rd Mar.Div) of the United States Marine Corps. Activated during World War II, the battalion provided vital engineering, mobility, and demolition support during major Pacific campaigns, including the battles of Bougainville, Guam, and Iwo Jima. In the decades since, the 3rd Engr Bn has participated in numerous operations, offering construction, obstacle breaching, and survivability enhancements for Marine forces. Today, the battalion remains a key component of the 3rd Marine Division, supporting expeditionary operations throughout the Indo-Pacific region.