1st Combat Engineer Battalion

The 1st Combat Engineer Battalion (1st CEB) is a United States Marine Corps unit formed during World War II in 1941 as the 1st Pioneer Battalion. The battalion provided vital engineering support during key Pacific campaigns, including Guadalcanal, Peleliu, and Okinawa. Post-war, 1st CEB participated in the Korean War, Vietnam War, and later operations in the Middle East such as Operation Desert Storm, Operation Iraqi Freedom, and Operation Enduring Freedom in Afghanistan. Headquartered at Marine Corps Base Camp Pendleton, California, the battalion continues to support the 1st Marine Division with mobility, counter-mobility, and survivability operations.