Con Thien is located at 16°54′35″N 106°58′48″E (MGRS 48QYD113703) and was originally established as a Special Forces/CIDG camp on 20 February 1967 at Hill 158 by Special forces Det.
A-110.
 The camp was built by a detachment from Naval Mobile Construction Battalion 4.
and turned over to the 1st Battalion, 9th Marines, on 27 July 1967.
 Together with Marine bases at Gio Linh, Đông Hà and Cam Lộ, Con Thien enclosed the area known to the Marines as Leatherneck Square.
Con Thien was intended to be used as a base for the McNamara Line to prevent People's Army of Vietnam (PAVN) infiltration across the DMZ.
The firebase was strategically important because it offered unfettered views for 15 km east to the coast and north into North Vietnam.
It was also very vulnerable because it was within range of PAVN artillery north of the DMZ which was largely immune to counter-battery fire.
Con Thien is located at 16°54′35″N 106°58′48″E (MGRS 48QYD113703) and was originally established as a Special Forces/CIDG camp on 20 February 1967 at Hill 158 by Special forces Det. A-110.  The camp was built by a detachment from Naval Mobile Construction Battalion 4. and turned over to the 1st Battalion, 9th Marines, on 27 July 1967.  Together with Marine bases at Gio Linh, Đông Hà and Cam Lộ, Con Thien enclosed the area known to the Marines as Leatherneck Square. Con Thien was intended to be used as a base for the McNamara Line to prevent People's Army of Vietnam (PAVN) infiltration across the DMZ. The firebase was strategically important because it offered unfettered views for 15 km east to the coast and north into North Vietnam. It was also very vulnerable because it was within range of PAVN artillery north of the DMZ which was largely immune to counter-battery fire.
Con Thien