Ca Lu Combat Base
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.

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 Lt. Col. Gorton C. Cook manned both The Rockpile and Ca Lu Combat Base in 1968.

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. Operation Lancaster II followed directly after Operation Lancaster was a multi-Battalion operation that ran from 21 January and lasted until 23 November 1968, resulting in 1,801 known North Vietnamese casualties and 359 killed U.S. Marines and 1,713 wounded.