The 4th Combat Engineer Battalion (4th CEB) is a combat engineer battalion of the United States Marine Corps

United States Marine Corps

The United States Marine Corps is a branch of the United States Armed Forces responsible for providing power projection from the sea, using the mobility of the United States Navy to deliver combined-arms task forces rapidly. It is one of seven uniformed services of the United States...

 reserve. Their headquarters are in Baltimore, Maryland but they have units in West Virginia

West Virginia

West Virginia is a state in the Appalachian and Southeastern regions of the United States, bordered by Virginia to the southeast, Kentucky to the southwest, Ohio to the northwest, Pennsylvania to the northeast and Maryland to the east...

, Virginia

Virginia

The Commonwealth of Virginia , is a U.S. state on the Atlantic Coast of the Southern United States. Virginia is nicknamed the "Old Dominion" and sometimes the "Mother of Presidents" after the eight U.S. presidents born there...

 and Tennessee

Tennessee

Tennessee is a U.S. state located in the Southeastern United States. It has a population of 6,346,105, making it the nation's 17th-largest state by population, and covers , making it the 36th-largest by total land area...

. They belong to the 4th Marine Division and Marine Forces Reserve.

Activated 25 August 1943 at Camp Pendleton, California, as Headquarters Company, 1st Battalion, 20th Marines

20th Marine Regiment (United States)

20th Marine Regiment was an engineer regiment of the United States Marine Corps that fought during World War II.-Subordinate units:* Headquarters & Services Company* 1st Battalion 20th Marines* 2nd Battalion 20th Marines* 3rd Battalion 20th Marines...

, 4th Marine Division, Fleet Marine Force.