The 4th Combat Engineer Battalion (4th CEB) is a

combat engineer A combat engineer (also called pioneer or sapper) is a type of soldier who performs military engineering tasks in support of land forces combat operations. Combat engineers perform a variety of military engineering, Tunnel warfare, tunnel and l ...

battalion of the

United States Marine Corps Reserve The Marine Forces Reserve (MARFORRES or MFR), also known as the United States Marine Corps Reserve (USMCR) and the U.S. Marine Corps Forces Reserve, is the reserve force of the United States Marine Corps. The Marine Corps Reserve is an expedit ...

. The headquarters is in

Baltimore Baltimore is the most populous city in the U.S. state of Maryland. With a population of 585,708 at the 2020 census and estimated at 568,271 in 2024, it is the 30th-most populous U.S. city. The Baltimore metropolitan area is the 20th-large ...

, Maryland and the Battalion has units in

West Virginia West Virginia is a mountainous U.S. state, state in the Southern United States, Southern and Mid-Atlantic (United States), Mid-Atlantic regions of the United States.The United States Census Bureau, Census Bureau and the Association of American ...

Alabama Alabama ( ) is a U.S. state, state in the Southeastern United States, Southeastern and Deep South, Deep Southern regions of the United States. It borders Tennessee to the north, Georgia (U.S. state), Georgia to the east, Florida and the Gu ...

Virginia Virginia, officially the Commonwealth of Virginia, is a U.S. state, state in the Southeastern United States, Southeastern and Mid-Atlantic (United States), Mid-Atlantic regions of the United States between the East Coast of the United States ...

, and

Tennessee Tennessee (, ), officially the State of Tennessee, is a landlocked U.S. state, state in the Southeastern United States, Southeastern region of the United States. It borders Kentucky to the north, Virginia to the northeast, North Carolina t ...

. They belong to the

4th Marine Division The 4th Marine Division is a reserve division in the United States Marine Corps. It was raised in 1943 for service during World War II, and subsequently fought in the Pacific against the Japanese. Deactivated after the war, the division was re ...

of the

Marine Forces Reserve The Marine Forces Reserve (MARFORRES or MFR), also known as the United States Marine Corps Reserve (USMCR) and the U.S. Marine Corps Forces Reserve, is the reserve force of the United States Marine Corps. The Marine Corps Reserve is an expedit ...

Organization

History

World War II

Activated 25 August 1943 at

Camp Pendleton, California Marine Corps Base Camp Pendleton is the major West Coast of the United States, West Coast base of the United States Marine Corps and is one of the largest Marine Corps bases in the United States. It is on the Southern California coast in San Di ...

, as Headquarters Company, 1st Battalion,

20th Marines 20th Marine Regiment was a Composite Engineer Regiment of the United States Marine Corps that fought during World War II.U.S. Marine Corps World War II Order of Battle Fleet Marine Force Ground Units, Rottman p. 220''/ref> Subordinate units T ...

, Fleet Marine Force. Deployed during February 1944 to the

Pacific Theater The Pacific Ocean is the largest and deepest of Earth's five oceanic divisions. It extends from the Arctic Ocean in the north to the Southern Ocean, or, depending on the definition, to Antarctica in the south, and is bounded by the continen ...

. Redesignated 31 August, as Headquarters and Service Company, 4th Engineer Battalion, 4th Marine Division. Participated in the

Battle of Kwajalein The Battle of Kwajalein was fought as part of the Pacific campaign of World War II. It took place 31 January – 3 February 1944, on Kwajalein Atoll in the Marshall Islands. Employing the hard-learned lessons of the Battle of Tarawa, the Unite ...

Battle of Saipan The Battle of Saipan was an amphibious assault launched by the United States against the Empire of Japan during the Pacific War, Pacific campaign of World War II between 15 June and 9 July 1944. The initial invasion triggered the Battle of the ...

Battle of Tinian The Battle of Tinian was part of the Pacific War, Pacific campaign of World War II. It was fought between the United States and Japan on the island of Tinian in the Mariana Islands from 24 July until 1 August 1944. The battle saw napalm used f ...

and the

Battle of Iwo Jima The was a major battle in which the United States Marine Corps (USMC) and United States Navy (USN) landed on and eventually captured the island of Iwo Jima from the Imperial Japanese Army (IJA) during World War II. The American invasion, desi ...

. Redeployed during October 1945 to

Maui Maui (; Hawaiian language, Hawaiian: ) is the second largest island in the Hawaiian archipelago, at 727.2 square miles (1,883 km2). It is the List of islands of the United States by area, 17th-largest in the United States. Maui is one of ...

, Hawaii. Relocated during November 1945 to Camp Pendleton, California, where it was deactivated on 15 November 1945.

1951–2000

Reactivated on 1 November 1951 at

, Maryland, as Headquarters Company, 1st Engineer Battalion. Redesignated 1 July 1962 as 4th Engineer Battalion, 4th Marine Division. Redesignated 1 June 1976 as 4th Combat Engineer Battalion, 4th Marine Division. Participated in numerous training exercises throughout the 1970s and 1980s. Called to Active Duty December 1990 to participate in the Persian Gulf War. Released from Active Duty May 1991.

Global War on Terror

In January 2003 the Battalion activated and deployed personnel in support of the initial invasion of the

Iraq War The Iraq War (), also referred to as the Second Gulf War, was a prolonged conflict in Iraq lasting from 2003 to 2011. It began with 2003 invasion of Iraq, the invasion by a Multi-National Force – Iraq, United States-led coalition, which ...

(Operation Iraqi Freedom). December 2004 activated and deployed personnel to serve as members of the 5th Civil Affairs Group and continue to support Operation Iraqi Freedom and

Operation Enduring Freedom Operation Enduring Freedom (OEF) was the official name used by the U.S. government for both the first stage (2001–2014) of the War in Afghanistan (2001–2021) and the larger-scale Global War on Terrorism. On 7 October 2001, in response ...

. Eight members of the battalion were killed while on operations in Iraq.

Notable former members

* Rob Jones

References

: ;Web
4th CEB's official website
{{4thMarDiv 4th Marine Division (United States) CEB4