The Rockpile (also known as Elliot Combat Base) and known in Vietnamese as Thon Khe Tri, is a solitary karst rock outcropping north of Route 9 and south of the former Vietnamese Demilitarized Zone (DMZ). It rises to an elevation of 240 metres (790 ft) MSL, about 210 metres (690 ft) above the surrounding terrain. Its relatively inaccessible location, reached only by helicopter, made it an important United States Army and Marine Corps observation post and artillery base from 1966 to 1969.
Jewett, Rus. "Gruntfixer: An accounting of my experiences as a Hospital Corpsman attached to "Ripley's Raiders" Lima Company 3rd Battalion 3rd Marines – 1967".External link in |title= (help);Missing or empty |url= (help)