Ca Lu Combat Base
|Ca Lu Combat Base|
|Quảng Trị Province|
Ca Lu Combat Base in December 1968
Ca Lu Combat Base (Vietnamese: Cà Lu) was a United States Marine Corps base located on Highway or Route 9, near Krông Klang, Đa Krông District, western Quảng Trị Province, South Vietnam.  Operation Lancaster ran between 1 November 1967 and 20 January 1968, where the 9th Marine Regiment suffered 27 killed and 106 wounded and the North Vietnamese 46 killed.
Ca Lu was the western terminus of Highway 9 for the U.S. Marines since the road was cut between there and the Khe Sanh Combat Base. The 3rd Marine Division had overall command and control of the DMZ area. The 3d Battalion, 9th Marine Regiment under LtCol Gorton C. Cook manned both The Rockpile and Ca Lu Combat Base in 1968.
Operation Lancaster II followed directly after Operation Lancaster was a multi-Battalion operation that ran from January 21 and lasted until 23 November 1968, resulting in 1,801 known North Vietnamese casualties and 359 killed U.S. Marines and 1,713 wounded.
- Kelley, Michael (2002). Where we were in Vietnam. Hellgate Press. pp. 5–79. ISBN 978-1555716257.
- Pike, COL Thomas F. "Military Records, February 1968, 3rd Marine Division: The Tet Offensive". Charleston: Creatspace. ISBN 978-1-481219-46-4.