Remilitarizing The DMZ
After the 8 May attack, recognizing that the NVA were using the DMZ as a sanctuary for attacks into I Corps, Washington lifted the prohibition on US forces entering the DMZ and MACV authorized the III Marine Amphibious Force (III MAF) to conduct combat operations into the southern half of the DMZ.
From 13–16 May, 1/9 Marines cleared Route 561 from Cam Lo to Con Thien fought a well-entrenched NVA force south of the base. The NVA subsequently withdrew into the DMZ.
Read more about this topic: Con Thien